CAMRT Certification Exam (Radiological Technology) — Questions and Answers

Question 1: What is the recommended maximum contrast volume for a patient with eGFR of 35 mL/min?

No contrast should be administered
Standard volumes without restriction
Volume should not exceed the eGFR value (35 mL) (Correct answer)
Reduce to 50% of standard dose

Correct answer: Volume should not exceed the eGFR value (35 mL)

The contrast volume-to-eGFR ratio guideline limits volume in mL to the eGFR value.

Question 2: What projections constitute a standard knee series?

AP, lateral, and obliques showing joint space, patella, and tibial plateaus respectively (Correct answer)
Only AP
Only lateral
AP and sunrise only

Correct answer: AP, lateral, and obliques showing joint space, patella, and tibial plateaus respectively

Multiple projections demonstrate different structures without superimposition.

Question 3: What should a technologist do if faced with an ethical dilemma during patient care?

Wait for a supervisor's directive.
Ignore the situation and proceed with care.
Consult the CAMRT Code of Ethics for guidance. (Correct answer)
Rely solely on their personal judgment.

Correct answer: Consult the CAMRT Code of Ethics for guidance.

The CAMRT Code of Ethics provides a structured framework and clear principles to guide technologists through complex ethical situations in practice. Consulting it ensures that decisions are made based on established professional values and standards, rather than solely on personal judgment, promoting consistent and ethically sound patient care.

Question 4: What must a technologist do when performing an unfamiliar procedure?

Refuse entirely
Acknowledge limitations, seek guidance from colleagues or references, ensure patient safety (Correct answer)
Perform at reduced standard
Attempt it and hope for the best

Correct answer: Acknowledge limitations, seek guidance from colleagues or references, ensure patient safety

Recognize limitations, seek guidance, and ensure safe patient care.

Question 5: The Judet method, which consists of two 45-degree oblique projections of the pelvis, is specifically designed to visualize the anatomy of the:

Femoral head and neck
Acetabulum (Correct answer)
Sacroiliac joints
Pubic symphysis

Correct answer: Acetabulum

The Judet views (iliac and obturator oblique) are specialized projections used to assess for fractures of the acetabulum. By rotating the patient 45 degrees for each view, the anterior and posterior columns of the acetabulum are projected free of superimposition, which is critical for accurate diagnosis and surgical planning.

Question 6: An MRT is preparing to perform a procedure on a patient who does not speak English or French. The patient is accompanied by their 12-year-old grandchild, who offers to translate. What is the MRT's most appropriate course of action?

Use simple gestures and point to the equipment to explain the procedure non-verbally.
Refuse to perform the procedure until a professional medical interpreter is available.
Request a qualified medical interpreter or use a hospital-approved telephone interpretation service. (Correct answer)
Proceed with the procedure using the grandchild as the translator to be efficient.

Correct answer: Request a qualified medical interpreter or use a hospital-approved telephone interpretation service.

Using a child or untrained family member as an interpreter is not appropriate as they may not understand medical terminology, may filter information, and it places undue responsibility on them. The standard of care is to use a qualified medical interpreter to ensure accurate communication, maintain confidentiality, and obtain valid informed consent, which is crucial for providing culturally safe care.

Question 7: Oesophageal perforation is suspected during a barium swallow. Which contrast should be used?

Gastrografin
Gadolinium
Air contrast only
Water-soluble low-osmolality non-ionic contrast (Correct answer)

Correct answer: Water-soluble low-osmolality non-ionic contrast

Low-osmolality non-ionic contrast is safest when perforation is suspected.

Question 8: What resource does CAMRT provide to support professional development?

Financial assistance for advanced degrees.
Subsidized fees for international conferences.
Access to webinars, courses, and journals. (Correct answer)
Guidelines for career transitions.

Correct answer: Access to webinars, courses, and journals.

CAMRT actively supports its members' professional development by providing access to a variety of educational resources. These include online webinars, specialized courses, and professional journals. These resources are specifically designed to help members stay current with industry trends, enhance their skills, and meet their continuing education requirements.

Question 9: Which CT scan parameter, when increased, primarily reduces image noise?

Increasing table speed
Increasing kVp only
Increasing pitch
Increasing mAs (tube current × time) (Correct answer)

Correct answer: Increasing mAs (tube current × time)

Increasing mAs increases the number of photons reaching the detector, reducing quantum mottle (image noise), but at the cost of higher patient dose.

Question 10: A 68-year-old patient with type 2 diabetes is scheduled for a contrast-enhanced CT of the abdomen. The patient's medication list includes Metformin. Their most recent lab results show an eGFR of 50 mL/min/1.73 m². Based on the Canadian Association of Radiologists (CAR) guidelines, what is the most appropriate action regarding the Metformin?

Proceed with the scan and instruct the patient to continue taking Metformin as prescribed. (Correct answer)
Instruct the patient to stop taking Metformin 48 hours before the scan.
Consult the radiologist to consider an alternative imaging modality not requiring contrast.
Administer a lower dose of contrast media and stop Metformin for 24 hours.

Correct answer: Proceed with the scan and instruct the patient to continue taking Metformin as prescribed.

According to the Canadian Association of Radiologists (CAR) guidelines, for patients with an estimated Glomerular Filtration Rate (eGFR) greater than 30 mL/min/1.73 m², it is not necessary to discontinue Metformin before or after the administration of iodinated contrast media. The patient's eGFR of 50 mL/min/1.73 m² is well above this threshold, indicating a low risk of contrast-associated acute kidney injury that could lead to lactic acidosis.

Question 11: What is the primary eligibility criterion to sit for the CAMRT certification exam?

Graduation from an accredited medical radiation technology program. (Correct answer)
Completion of a high school diploma.
Two years of clinical experience.
A recommendation from a supervisor.

Correct answer: Graduation from an accredited medical radiation technology program.

The primary eligibility criterion to sit for the CAMRT certification exam is successful graduation from an accredited medical radiation technology program. This ensures that candidates have completed a structured and approved educational pathway. This foundational education provides them with the necessary knowledge and practical skills to attempt the national competency examination.

Question 12: What safety principle does the fluoroscopic 'dead man switch' enforce?

It requires continuous operator pressure to maintain X-ray production, preventing inadvertent prolonged exposure (Correct answer)
It prevents accidental patient movement by locking the table
It automatically logs total fluoroscopy time to the PACS system
It triggers an emergency shutdown of the entire X-ray generator on release

Correct answer: It requires continuous operator pressure to maintain X-ray production, preventing inadvertent prolonged exposure

The dead man switch requires the operator to continuously depress a footswitch or hand control to sustain fluoroscopic exposure; releasing it immediately terminates X-ray production, ensuring deliberate and active operator intent.

Question 13: A dosimeter was left on a sunlit windowsill over the weekend. What should the technologist do?

Report to the RSO, request replacement, note the incident for dose records (Correct answer)
Reset to zero
Continue using it
Discard without reporting

Correct answer: Report to the RSO, request replacement, note the incident for dose records

The incident must be reported so dose records can be annotated and a replacement issued.

Question 14: According to the Canadian Nuclear Safety Commission (CNSC) Radiation Protection Regulations, what is the annual effective dose limit for a Nuclear Energy Worker (NEW)?

20 mSv per year averaged over a five-year period
50 mSv in any one year, and 100 mSv over five consecutive years (Correct answer)
1 mSv in a calendar year
4 mSv for the balance of a declared pregnancy

Correct answer: 50 mSv in any one year, and 100 mSv over five consecutive years

The CNSC sets the effective dose limits for a Nuclear Energy Worker at 50 mSv in any single year and 100 mSv over a five-year period. The 1 mSv limit is for the general public, the 20 mSv/year averaged limit is a common administrative control level but not the regulatory maximum, and the 4 mSv limit applies specifically to pregnant workers after declaration.

Question 15: What is the primary function of an endovascular stent placed after balloon angioplasty?

To provide a permanent structural scaffold that maintains vessel patency and prevents elastic recoil or restenosis (Correct answer)
To serve as a conduit for tissue biopsy collection
To continuously inject anticoagulants into the vessel lumen
To measure intravascular pressure continuously after the procedure

Correct answer: To provide a permanent structural scaffold that maintains vessel patency and prevents elastic recoil or restenosis

A stent is a metallic (or polymer) scaffold deployed within the vessel to oppose elastic recoil, tack up dissection flaps, and maintain the increased luminal diameter achieved by angioplasty.

Question 16: A 17-year-old patient, who is legally able to consent for themselves, agrees to an abdominal CT scan but halfway through the procedure, they state, 'Stop, I don't want to do this anymore.' What is the MRT's ethical obligation?

Consult with the patient's parents before deciding whether to stop the scan.
Explain that the procedure is almost done and continue to get the necessary images.
Immediately cease the procedure and ensure the patient is safe and comfortable.
Tell the patient they already consented and that stopping now would waste resources. (Correct answer)

Correct answer: Tell the patient they already consented and that stopping now would waste resources.

Informed consent is an ongoing process, and a capable patient has the right to withdraw consent at any time, before or during a procedure. The MRT's primary ethical duty is to respect the patient's autonomy and decision. The CAMRT Code of Ethics supports facilitating and supporting the free and informed choices of patients, including the decision to withdraw from treatment.

Question 17: Which of the following best describes the primary objective of Health Canada's Safety Code 35?

To provide guidance for minimizing radiation exposure to patients, staff, and the public, while ensuring diagnostic image quality. (Correct answer)
To mandate specific exposure techniques for all diagnostic imaging procedures.
To set the purchase price and specifications for all new radiological equipment sold in Canada.
To define the scope of practice for Medical Radiation Technologists and Radiologists.

Correct answer: To provide guidance for minimizing radiation exposure to patients, staff, and the public, while ensuring diagnostic image quality.

Health Canada's Safety Code 35 aims to provide guidance to achieve three main objectives: minimizing patient dose while maintaining diagnostic quality, ensuring adequate protection for equipment operators, and ensuring the protection of the public near X-ray facilities.

Question 18: During a barium swallow examination, why are multiple projections (AP, lateral, oblique) obtained rather than a single view?

To comprehensively evaluate esophageal anatomy and function from all angles and detect lesions that may be obscured in one view (Correct answer)
To reduce total radiation dose by spreading exposure over multiple positions
To comply with mandatory CAMRT positioning protocols
Because a single lateral view is insufficient for contrast media flow

Correct answer: To comprehensively evaluate esophageal anatomy and function from all angles and detect lesions that may be obscured in one view

Multiple projections are required to fully assess esophageal morphology and motility, as lesions or structural abnormalities may be hidden behind overlying structures in any single projection.

Question 19: When evaluating a lateral cervical spine radiograph for technical adequacy, which of the following is the most critical criterion for ensuring the entire spine is visualized for diagnostic purposes?

The prevertebral soft tissue shadow is within normal limits.
The spinous processes are seen in profile with no rotation.
The rami of the mandible are perfectly superimposed.
The C7-T1 vertebral space is clearly demonstrated. (Correct answer)

Correct answer: The C7-T1 vertebral space is clearly demonstrated.

The C7-T1 junction is a common site for trauma that can be obscured by the shoulder girdle. It is mandatory for a diagnostic lateral cervical spine radiograph to clearly demonstrate all seven cervical vertebrae and the superior aspect of T1. If this area is not visualized, a supplementary view, such as a swimmer's (Twining method), must be performed.

Question 20: According to CNSC regulations, what is the annual effective dose limit for radiation workers?

20 mSv
100 mSv
50 mSv (Correct answer)
10 mSv

Correct answer: 50 mSv

The annual limit is 50 mSv with a 5-year cumulative limit of 100 mSv.

Question 21: In a conventional image intensifier, what is the correct sequence of conversions that produces a visible fluoroscopic image?

X-rays → TV camera → phosphor → electrons
X-rays → input phosphor (light) → photocathode (electrons) → output phosphor (light) → TV camera (Correct answer)
X-rays → photocathode → input phosphor → electrons → TV camera
X-rays → electrons → light → TV camera

Correct answer: X-rays → input phosphor (light) → photocathode (electrons) → output phosphor (light) → TV camera

The image intensifier converts X-rays to light via the input phosphor, then to electrons via the photocathode; electrons are accelerated to the output phosphor, producing a bright, minified image captured by the TV camera.

Question 22: An elderly patient scheduled for a CT scan of the abdomen expresses significant anxiety about the procedure, stating, "I'm worried about the radiation and what you might find." What is the MOST appropriate initial response for a Medical Radiation Technologist (MRT)?

"We do this all the time and everything will be fine. We just need to get this done quickly."
"Don't worry, the radiation dose is very low and your doctor knows what's best."
"You have the right to refuse the scan if you're too nervous, but your doctor ordered it for a reason."
"I can see you're concerned. Let's talk about the procedure. What specific questions do you have about the radiation or the process?" (Correct answer)

Correct answer: "I can see you're concerned. Let's talk about the procedure. What specific questions do you have about the radiation or the process?"

The correct response uses therapeutic communication techniques by acknowledging the patient's feelings (empathy), opening a dialogue, and inviting the patient to voice specific concerns. This approach respects patient autonomy and helps in providing clear, factual information to alleviate fears, as supported by the CAMRT's emphasis on patient-centered care and informed decision-making.

Question 23: Which positioning method is used to demonstrate the scaphoid without foreshortening?

AP with radial deviation
PA with ulnar deviation (Correct answer)
Lateral wrist
Oblique wrist

Correct answer: PA with ulnar deviation

PA projection with ulnar deviation (ulnar flexion) extends the scaphoid and aligns it parallel to the IR, reducing foreshortening.

Question 24: Which property of an iodinated contrast agent is the primary determinant of its potential to cause immediate, dose-dependent, non-allergic adverse effects such as a heat sensation, discomfort, and nausea?

Viscosity
Osmolality (Correct answer)
pH level
Iodine concentration

Correct answer: Osmolality

Osmolality refers to the concentration of particles dissolved in a fluid. High-osmolality contrast media (HOCM) have a much higher concentration of particles than blood plasma, causing a rapid shift of fluid into the vascular space. This shift is responsible for many of the chemotoxic, non-allergic reactions like sensations of heat, pain at the injection site, and nausea. Low-osmolality (LOCM) and iso-osmolar (IOCM) agents were developed to minimize these effects.

Question 25: An MRT observes a thin, perfectly straight, dark line appearing in the exact same location on every image acquired from a specific direct radiography (DR) flat-panel detector. This occurs regardless of the patient or anatomical part being imaged. What is the MOST likely cause of this artifact?

Grid cut-off due to improper alignment
A scratch on the surface of the collimator mirror
Patient motion during the exposure
A row of defective detector elements (pixels) (Correct answer)

Correct answer: A row of defective detector elements (pixels)

A consistent, straight line appearing in the identical position on all images from a specific detector points to a hardware failure within the detector itself. A row of defective or 'dead' pixels will fail to capture data, resulting in a line artifact that cannot be corrected by changing technique or patient positioning.

Question 26: What distinguishes ionic from non-ionic iodinated contrast media?

Non-ionic agents are always iso-osmolar
Ionic agents are water-soluble while non-ionic are oil-based
Non-ionic agents do not dissociate, resulting in lower osmolality (Correct answer)
Ionic agents contain more iodine per molecule

Correct answer: Non-ionic agents do not dissociate, resulting in lower osmolality

Non-ionic agents remain as single molecules in solution, reducing particle count and osmolality.

Question 27: Which artifact in CT is caused by very dense structures (such as metal implants) and appears as dark and light streaks radiating from the object?

Partial volume artifact
Ring artifact
Beam-hardening/metal artifact (Correct answer)
Motion artifact

Correct answer: Beam-hardening/metal artifact

Metal implants absorb x-rays so strongly that insufficient photons reach the detector, causing beam-hardening and photon starvation, producing characteristic streak artifacts.

Question 28: What is the purpose of double-contrast barium enema technique?

Coat mucosa with barium while air distends the lumen for detailed mucosal pathology visualization (Correct answer)
Speed up the examination
Reduce radiation dose
Reduce barium needed

Correct answer: Coat mucosa with barium while air distends the lumen for detailed mucosal pathology visualization

Thin barium coating highlights surface abnormalities while air distension provides contrast.

Question 29: What is the modulation transfer function (MTF) used for in imaging?

Calculating detector dynamic range
Measuring patient dose
Quantifying how well a system preserves spatial frequency information (Correct answer)
Assessing detector response uniformity

Correct answer: Quantifying how well a system preserves spatial frequency information

MTF measures how effectively contrast is transferred at various spatial frequencies.

Question 30: Which of the following technical factor adjustments will increase the penetrability of the x-ray beam, resulting in lower image contrast?

Increasing the mAs
Using a smaller focal spot
Decreasing the SID
Increasing the kVp (Correct answer)

Correct answer: Increasing the kVp

Kilovoltage peak (kVp) controls the kinetic energy of the electrons striking the anode, which in turn determines the maximum energy and overall quality of the x-ray photons. Increasing the kVp produces a higher-energy, more penetrating x-ray beam. This increased penetration leads to less differential absorption between tissues, resulting in a longer scale of contrast (more shades of gray).

Question 31: What is a diagnostic reference level (DRL)?

Minimum dose for a diagnostic image
A benchmark that when consistently exceeded triggers protocol optimization investigation (Correct answer)
Only for fluoroscopy
A dose limit never to be exceeded

Correct answer: A benchmark that when consistently exceeded triggers protocol optimization investigation

DRLs are investigation benchmarks, not dose limits, set at the 75th percentile of dose distributions.

Question 32: What is the purpose of collimator light-to-radiation field alignment testing?

Measure detector uniformity
Verify tube output consistency
Ensure the light field accurately represents the irradiated area (Correct answer)
Check AEC chamber positions

Correct answer: Ensure the light field accurately represents the irradiated area

Alignment testing verifies the collimator light accurately indicates X-ray field boundaries.

Question 33: What are the Ottawa Ankle Rules?

Clinical decision rules determining whether ankle radiographs are needed based on physical findings (Correct answer)
Radiation dose limits for ankles
Positioning guidelines for ankle X-rays
Image quality evaluation criteria

Correct answer: Clinical decision rules determining whether ankle radiographs are needed based on physical findings

Validated rules that reduce unnecessary ankle imaging by 30-40%.

Question 34: How do CAMRT ethical standards address truthfulness and error disclosure?

Only physician should disclose
Only disclose if patient asks
Errors should be concealed
Ethical obligation to be truthful, disclose errors through institutional processes, and participate in QI (Correct answer)

Correct answer: Ethical obligation to be truthful, disclose errors through institutional processes, and participate in QI

Truthfulness and transparency about errors are fundamental ethical obligations.

Question 35: A medical radiation technologist is performing a mobile chest X-ray on a patient in the intensive care unit. To adhere to the ALARA principle, which of the following is the most effective action the technologist can take to minimize their own radiation exposure?

Increase the distance from the patient and primary beam to at least 2 meters during the exposure. (Correct answer)
Collimate the beam tightly to the area of interest.
Use the shortest possible exposure time.
Wear a lead apron of 0.25 mm lead equivalency.

Correct answer: Increase the distance from the patient and primary beam to at least 2 meters during the exposure.

While all options are good radiation safety practices, the inverse square law states that radiation intensity decreases by the square of the distance from the source. Therefore, increasing distance is the most effective means for an operator to reduce their dose from scatter radiation during a mobile examination.

Question 36: Which document is mandatory for applying for CAMRT membership?

Reference letters from supervisors.
Proof of residency status.
Proof of graduation from an accredited program. (Correct answer)
A copy of their professional resume.

Correct answer: Proof of graduation from an accredited program.

To apply for CAMRT membership, candidates must submit official proof of graduation from an accredited medical radiation technology program. This documentation, typically a transcript or diploma, verifies that they have met the educational requirements. It is a fundamental step in confirming their qualifications and eligibility for professional practice.

Question 37: What ethical implications does AI present in medical radiation technology?

No ethical implications
Ethics only apply to AI developers
AI will replace technologists so ethics are irrelevant
Questions about accountability, consent, algorithmic bias, job displacement, and need for human oversight (Correct answer)

Correct answer: Questions about accountability, consent, algorithmic bias, job displacement, and need for human oversight

AI raises questions about accountability, consent, bias, and the essential role of human oversight.

Question 38: What does the term 'slice thickness' affect in CT image quality?

Scan time only
Z-axis resolution and partial volume averaging (Correct answer)
Only image noise
Only contrast resolution

Correct answer: Z-axis resolution and partial volume averaging

Thinner slices improve z-axis (longitudinal) spatial resolution and reduce partial volume averaging, but increase image noise.

Question 39: What is the purpose of dose-area product (DAP) measurement?

Measure skin surface dose only
Verify AEC accuracy
Estimate total radiation energy delivered, accounting for dose and field size (Correct answer)
Calculate effective dose for reporting

Correct answer: Estimate total radiation energy delivered, accounting for dose and field size

DAP measures air kerma multiplied by irradiated area, estimating total radiation energy.

Question 40: For an AP shoulder, how should the arm be positioned to show the greater tuberosity in profile?

Internal rotation with hand on hip
Full 90-degree abduction
External rotation with hand supinated and epicondyles parallel to detector (Correct answer)
Neutral position at side

Correct answer: External rotation with hand supinated and epicondyles parallel to detector

External rotation places the greater tuberosity in lateral profile.

Question 41: Initial radiographs are normal for a suspected scaphoid fracture. What is recommended?

Immobilize and repeat in 10-14 days, or proceed to MRI or CT for earlier detection (Correct answer)
Bone scan immediately
Ultrasound of the wrist
No follow-up needed

Correct answer: Immobilize and repeat in 10-14 days, or proceed to MRI or CT for earlier detection

Up to 20% of scaphoid fractures are initially occult. Delayed diagnosis risks avascular necrosis.

Question 42: What is the concept of justification in radiation protection?

Only applies to CT
Using the lowest dose; technologist solely responsible
Every examination benefit must outweigh radiation risk; shared responsibility among physician, radiologist, and technologist (Correct answer)
Automatically met when a physician writes an order

Correct answer: Every examination benefit must outweigh radiation risk; shared responsibility among physician, radiologist, and technologist

Justification requires net benefit positive. It is a shared responsibility.

Question 43: A quality control test of an Automatic Exposure Control (AEC) system involves making several exposures of a phantom of varying thicknesses while keeping kVp and mA constant. The primary goal of this test is to verify that the AEC can maintain consistent:

Spatial resolution
Image receptor exposure (Correct answer)
Backup timer function
Minimum response time

Correct answer: Image receptor exposure

The fundamental purpose of an AEC system is to terminate the exposure once a preset amount of radiation has reached the detector, ensuring consistent image receptor exposure regardless of patient thickness. This QC test directly evaluates the AEC's ability to compensate for changes in attenuation by adjusting the exposure time.

Question 44: What is the primary safety concern when bringing ferromagnetic objects into the MRI suite?

Radiofrequency burns
Increased image noise
Projectile effect from strong magnetic field attraction (Correct answer)
Gradient coil failure

Correct answer: Projectile effect from strong magnetic field attraction

The strong static magnetic field accelerates ferromagnetic objects toward the magnet bore at high velocity, creating a dangerous projectile hazard.

Question 45: What is the purpose of the erect abdomen radiograph?

Only for kidney assessment
No difference from supine
Reduces radiation dose
Demonstrates air-fluid levels and free air under the diaphragm (Correct answer)

Correct answer: Demonstrates air-fluid levels and free air under the diaphragm

The erect view shows gravity-dependent air-fluid levels and pneumoperitoneum.

Question 46: A newly certified MRT feels overwhelmed transitioning from student to practitioner. What strategies help?

Work overtime for quick experience
Study for advanced certification immediately
Seek a mentor, set realistic goals, join graduate support programs, build a network (Correct answer)
Avoid challenging cases

Correct answer: Seek a mentor, set realistic goals, join graduate support programs, build a network

Mentorship, goal-setting, support programs, and networking help the transition.

Question 47: Which CT windowing setting would best display pulmonary parenchyma?

Window width 2000, level 500 (bone window)
Window width 80, level 35 (brain window)
Window width 1500, level −600 (lung window) (Correct answer)
Window width 400, level 40 (soft tissue)

Correct answer: Window width 1500, level −600 (lung window)

A wide window width (~1500 HU) centered at a low level (~−600 HU) is used for lung windows to display the air-filled parenchyma with adequate contrast.

Question 48: An MRT wants to develop interventional radiology expertise. What pathway is most appropriate?

Self-directed reading only
Online webinar series only
Structured combination of formal education, mentored clinical experience, and CPD activities (Correct answer)
Observing procedures for a few days

Correct answer: Structured combination of formal education, mentored clinical experience, and CPD activities

Subspecialty expertise requires structured education, supervised practice, and ongoing CPD.

Question 49: A patient presents to the emergency department with pain in the anatomical snuffbox after a fall on an outstretched hand (FOOSH). To best demonstrate a potential non-displaced scaphoid fracture, which additional projection is most critical to perform with the routine wrist series?

Ball-catcher's view (Norgaard method)
AP oblique wrist with 45-degree medial rotation
Carpal tunnel view (Gaynor-Hart method)
PA wrist with ulnar deviation (Correct answer)

Correct answer: PA wrist with ulnar deviation

Ulnar deviation of the wrist elongates the scaphoid bone, correcting its natural foreshortening and opening the adjacent joint spaces. This movement is essential for visualizing subtle, non-displaced fractures of the scaphoid waist that may not be apparent on a standard PA projection.

Question 50: A patient is scheduled for an MRI and becomes extremely agitated and claustrophobic upon seeing the scanner. Which communication strategy is MOST effective for the MRT to use first?

Calmly acknowledging their fear, explaining the coping mechanisms available (e.g., music, panic button), and offering to guide them through a breathing exercise. (Correct answer)
Telling the patient that they need to hold still or the images will be blurry.
Leaving the patient alone for a few minutes to calm down by themselves.
Suggesting immediate sedation to the patient as the only option.

Correct answer: Calmly acknowledging their fear, explaining the coping mechanisms available (e.g., music, panic button), and offering to guide them through a breathing exercise.

The most effective initial strategy is to use empathetic communication and offer the patient a sense of control. Acknowledging their feelings, explaining available coping tools like music or the panic button, and actively helping them with a relaxation technique like deep breathing can significantly reduce anxiety and improve cooperation. This patient-centered approach builds trust and often allows the procedure to proceed without more invasive interventions.

Question 51: How do gallbladder imaging positions differ between radiography and ultrasound?

Standing for both
Always supine for both
No difference
Radiography uses oblique positions to separate gallbladder from spine; ultrasound uses supine with liver as acoustic window (Correct answer)

Correct answer: Radiography uses oblique positions to separate gallbladder from spine; ultrasound uses supine with liver as acoustic window

Different modalities have different optimal positions based on their imaging physics.

Question 52: What ethical considerations apply when participating in research imaging?

Same protocols as clinical imaging
Ethics board approval, informed consent for research, protocol adherence, and dose justification (Correct answer)
No additional considerations
Only principal investigator considers ethics

Correct answer: Ethics board approval, informed consent for research, protocol adherence, and dose justification

Research imaging requires additional ethical safeguards including REB approval and specific consent.

Question 53: How does interprofessional education (IPE) contribute to MRT development?

Irrelevant to MRT practice
Only benefits physicians and nurses
Limited to learning about other professions
Develops collaborative competencies by learning with and from other healthcare professionals (Correct answer)

Correct answer: Develops collaborative competencies by learning with and from other healthcare professionals

IPE develops collaborative skills and mutual understanding that improve patient care.

Question 54: For a PA wrist radiograph, the central ray is directed to which carpal bone?

Scaphoid
Midcarpal area (capitate) (Correct answer)
Lunate
Pisiform

Correct answer: Midcarpal area (capitate)

The central ray is directed to the midcarpal area at the level of the capitate bone for a PA wrist projection.

Question 55: What is the purpose of the left lateral decubitus position for abdominal radiography?

Detect small amounts of free air rising to the right flank with horizontal beam (Correct answer)
Demonstrate NG tube position
Reduce radiation dose
Better left kidney visualization

Correct answer: Detect small amounts of free air rising to the right flank with horizontal beam

Free air rises to the non-dependent side when the patient lies on their left side.

Question 56: On a diagnostically acceptable PA chest radiograph, what is the minimum number of posterior ribs that should be visualized above the diaphragm to indicate adequate inspiration?

7
8
10 (Correct answer)
12

Correct answer: 10

A key evaluation criterion for a PA chest radiograph is adequate inspiration. This is generally confirmed when at least 10 posterior ribs are visible above the diaphragm. Visualizing fewer than 10 ribs can suggest a poor inspiratory effort, which may obscure pathology or mimic disease.

Question 57: What imaging protocol and findings are expected for suspected small bowel obstruction?

Single erect abdomen
Single supine radiograph
CT only, never plain radiographs
Acute abdominal series showing dilated loops over 3 cm, differential air-fluid levels, absent colonic gas (Correct answer)

Correct answer: Acute abdominal series showing dilated loops over 3 cm, differential air-fluid levels, absent colonic gas

The acute abdominal series includes supine, erect abdomen, and erect chest.

Question 58: What is the primary factor affecting spatial resolution in digital radiography?

Tube current (mA)
Exposure time
Detector element (del) size (Correct answer)
Source-to-image distance

Correct answer: Detector element (del) size

Del size is the primary determinant. Smaller dels resolve finer details.

Question 59: How do ethical standards address social media use by MRTs?

Must maintain confidentiality, boundaries, and professional reputation; never share patient information online (Correct answer)
Prohibited entirely
Unregulated
Guidelines only during work hours

Correct answer: Must maintain confidentiality, boundaries, and professional reputation; never share patient information online

Patient confidentiality and professional reputation must be maintained across all social media.

Question 60: What does the CAMRT annual conference provide for professional development?

Only social networking
Board member meetings only
Scientific presentations, workshops, vendor exhibitions, poster sessions, and pan-Canadian networking (Correct answer)
Online-only content

Correct answer: Scientific presentations, workshops, vendor exhibitions, poster sessions, and pan-Canadian networking

The conference offers comprehensive development including presentations, workshops, and networking.

Question 61: What does 'pulsed fluoroscopy' mean, and what is its primary benefit?

Alternating between high and low kVp to enhance contrast
Using grid pulsing to suppress scatter radiation
Rapidly acquiring sequential spot images for cine analysis
Delivering X-rays in discrete pulses rather than continuously, significantly reducing patient dose (Correct answer)

Correct answer: Delivering X-rays in discrete pulses rather than continuously, significantly reducing patient dose

Pulsed fluoroscopy produces X-rays only during brief discrete pulses, displaying each frame as a hold until the next pulse, which can reduce patient dose by 50–90% compared to continuous fluoroscopy.

Question 62: An agitated dementia patient is brought for a hip X-ray. What approach should be used?

Cancel the examination
Sedate the patient
Calm approach with simple instructions, involve caregiver, allow extra time, avoid arguing (Correct answer)
Restrain the patient

Correct answer: Calm approach with simple instructions, involve caregiver, allow extra time, avoid arguing

Dementia patients need calm, simple communication with familiar caregiver involvement.

Question 63: What is the standard imaging protocol for suspected pneumothorax?

Supine AP only
CT without plain films
Lateral in inspiration only
Erect PA chest on full expiration to increase contrast between collapsed lung and pleural air (Correct answer)

Correct answer: Erect PA chest on full expiration to increase contrast between collapsed lung and pleural air

Erect PA on expiration makes the pneumothorax proportionally more visible.

Question 64: A patient experiences a severe anaphylactoid reaction to contrast media, characterized by profound hypotension and severe bronchospasm. Which of the following is the first-line emergency medication that should be administered?

Diphenhydramine (Benadryl)
Atropine
Furosemide (Lasix)
Epinephrine (Adrenaline) (Correct answer)

Correct answer: Epinephrine (Adrenaline)

For a severe anaphylactoid reaction with life-threatening symptoms like severe bronchospasm and hypotension, intramuscular (IM) epinephrine is the first-line treatment. Epinephrine is a potent bronchodilator and vasoconstrictor that counteracts the most dangerous effects of the reaction. Diphenhydramine (an antihistamine) is a secondary treatment, while atropine is used for bradycardia and furosemide is a diuretic.

Question 65: What is proper positioning for a lateral cervical spine, and what must be demonstrated?

Erect true lateral, shoulders depressed, 72-inch SID; all 7 cervical vertebrae including C7-T1 (Correct answer)
Erect facing detector; C1-C4
Supine with lateral beam; C3-C7
Prone with chin elevated; C1-C5

Correct answer: Erect true lateral, shoulders depressed, 72-inch SID; all 7 cervical vertebrae including C7-T1

All 7 vertebrae including the C7-T1 junction must be demonstrated.

Question 66: In nuclear medicine, which radionuclide is most commonly used for bone scans?

Gallium-67 (Ga-67)
Thallium-201 (Tl-201)
Technetium-99m (Tc-99m) (Correct answer)
Iodine-131 (I-131)

Correct answer: Technetium-99m (Tc-99m)

Tc-99m labeled phosphonates (e.g., MDP) are the standard radiopharmaceuticals for bone scintigraphy due to their favorable physical properties and affinity for bone.

Question 67: Which rotation is used when performing an RPO (right posterior oblique) position?

Patient rotated with right side up away from table
Patient facing right with left side down
Patient lying on right side
Patient rotated with right posterior surface closest to IR (Correct answer)

Correct answer: Patient rotated with right posterior surface closest to IR

In an RPO position, the patient's right posterior surface is closest to the image receptor, with the body rotated so the right back is down.

Question 68: Which reconstruction algorithm in CT produces sharper edges and is preferred for bone imaging?

Lung kernel
Bone (sharp/high-frequency) kernel (Correct answer)
Standard (medium) kernel
Soft tissue (smooth) kernel

Correct answer: Bone (sharp/high-frequency) kernel

A sharp or high-frequency reconstruction kernel enhances edge definition, making it ideal for bone and high-contrast structure imaging despite increased image noise.

Question 69: What is the primary advantage of helical (spiral) CT over conventional axial CT?

Better spatial resolution
Elimination of beam-hardening artifacts
Continuous data acquisition allowing volume imaging and multiplanar reconstruction (Correct answer)
Lower radiation dose per slice

Correct answer: Continuous data acquisition allowing volume imaging and multiplanar reconstruction

Helical CT acquires a continuous volume of data during one breath-hold, enabling multiplanar reconstructions and reducing motion artifacts.

Question 70: What is scope of practice and why is it important for MRTs?

Only applies to physicians
Determined by individual confidence level
Same for all healthcare professionals
Defines activities an MRT is educated, competent, and authorized to perform, protecting patients and practitioners (Correct answer)

Correct answer: Defines activities an MRT is educated, competent, and authorized to perform, protecting patients and practitioners

Scope of practice creates boundaries ensuring patient safety and practitioner protection.

Question 71: Daily CT QC shows degraded low-contrast detectability. What should be investigated?

Gantry speed only
Monitor brightness
Room temperature, detector calibration, tube output, and noise levels (Correct answer)
Table calibration

Correct answer: Room temperature, detector calibration, tube output, and noise levels

Degraded LCD typically indicates increased noise from calibration drift, reduced output, or environmental factors.

Question 72: A patient with a pacemaker presents for an MRI examination. What is the most appropriate action?

Refuse the exam without any consultation
Perform the MRI immediately as modern pacemakers are always safe
Proceed with MRI using a lower field strength scanner
Consult the ordering physician and check if the pacemaker is MR-conditional before proceeding (Correct answer)

Correct answer: Consult the ordering physician and check if the pacemaker is MR-conditional before proceeding

MR technologists must verify the pacemaker model, determine if it is MR-conditional, and consult the ordering physician and MRI physicist before proceeding.

Question 73: An MRT notices a colleague frequently arriving at their shift smelling of alcohol. What is the most appropriate initial action according to professional practice standards?

Ignore the situation to avoid creating conflict in the workplace.
Report their observations to their immediate supervisor or manager. (Correct answer)
Confront the colleague directly and tell them to go home.
Wait to see if the colleague's work is visibly affected before taking action.

Correct answer: Report their observations to their immediate supervisor or manager.

Professional standards and the CAMRT Code of Ethics require MRTs to intervene when they witness unsafe practice. Practicing while impaired is a form of professional misconduct that jeopardizes patient safety. The correct procedure is not to confront the individual directly or wait for an error to occur, but to report the concerns to the appropriate authority, such as a supervisor, so the issue can be managed formally and safely.

Question 74: In MRI, the term 'T1-weighted image' refers to a sequence that highlights contrast based on:

Diffusion of water molecules
Spin-lattice (longitudinal) relaxation time differences between tissues (Correct answer)
Proton density only
Spin-spin relaxation time differences between tissues

Correct answer: Spin-lattice (longitudinal) relaxation time differences between tissues

T1 weighting uses the longitudinal (spin-lattice) relaxation time (T1) to differentiate tissues; fat appears bright and fluid appears dark on T1 images.

Question 75: Why must both hemidiaphragms be shown on abdominal radiographs?

No clinical significance
Required only post-surgery
Allows detection of free air and assessment of lower lobe pathology mimicking abdominal disease (Correct answer)
Only important for chest imaging

Correct answer: Allows detection of free air and assessment of lower lobe pathology mimicking abdominal disease

Hemidiaphragm inclusion enables pneumoperitoneum detection and lower lobe pathology identification.

Question 76: Which fluoroscopic technique reduces patient dose by pulsing the x-ray beam rather than continuous fluoroscopy?

Pulsed progressive fluoroscopy (Correct answer)
Digital subtraction angiography
High-dose-rate fluoroscopy
Last-image-hold (LIH) only

Correct answer: Pulsed progressive fluoroscopy

Pulsed progressive fluoroscopy delivers x-ray pulses at lower frame rates, significantly reducing patient and staff dose compared to continuous fluoroscopy.

Question 77: What must a properly positioned PA chest demonstrate?

Only lung fields and heart
Only heart and great vessels
Only lung bases and diaphragm
Both lung fields, costophrenic angles, heart, mediastinum, thoracic spine, and apices free from clavicular superimposition (Correct answer)

Correct answer: Both lung fields, costophrenic angles, heart, mediastinum, thoracic spine, and apices free from clavicular superimposition

All thoracic structures must be demonstrated with proper positioning criteria.

Question 78: What is the correct positioning for the AP open-mouth (odontoid) projection?

Patient opens mouth widely for AP projection through the open mouth to C1-C2, showing dens between C1 lateral masses (Correct answer)
PA through the open mouth
AP with mouth closed at C3
Lateral with mouth open

Correct answer: Patient opens mouth widely for AP projection through the open mouth to C1-C2, showing dens between C1 lateral masses

The open-mouth view demonstrates the dens of C2 framed between the lateral masses of C1.

Question 79: What is the current Canadian fasting protocol for elective contrast-enhanced CT?

No fasting required; adequate hydration encouraged (Correct answer)
NPO 8 hours, clear fluids until 2 hours before
NPO 12 hours
NPO 4 hours solids, 2 hours clear fluids

Correct answer: No fasting required; adequate hydration encouraged

Current guidelines no longer require routine fasting, as it does not reduce reactions and may worsen dehydration.

Question 80: A patient develops bronchospasm during contrast-enhanced CT. What is the first-line treatment?

IV atropine
IV diphenhydramine
Subcutaneous epinephrine
Nebulized salbutamol (Correct answer)

Correct answer: Nebulized salbutamol

Nebulized salbutamol directly relaxes bronchial smooth muscle for isolated bronchospasm.

Question 81: What is the role of the Radiation Safety Officer in a medical imaging facility?

Only manages radioactive waste
Optional role in Canadian facilities
Only purchases dosimeters
Oversees radiation protection program, ensures regulatory compliance, monitors doses, investigates incidents, provides education (Correct answer)

Correct answer: Oversees radiation protection program, ensures regulatory compliance, monitors doses, investigates incidents, provides education

The RSO implements and maintains the complete radiation protection program.

Question 82: How should the anode heel effect be utilized in clinical practice?

It causes uniform exposure; no positioning needed
Higher intensity on anode side; thicker parts toward anode
Only affects mammography
Higher intensity on cathode side; position thicker body parts toward cathode (Correct answer)

Correct answer: Higher intensity on cathode side; position thicker body parts toward cathode

Greater intensity on the cathode side due to self-absorption in the anode. Thicker parts go toward the cathode.

Question 83: In percutaneous transluminal angioplasty (PTA), what is the mechanism by which the balloon catheter restores blood flow?

It aspirates plaque material from the vessel wall
It injects thrombolytic drugs directly into the clot
It is inflated within a stenotic vessel segment to mechanically dilate the narrowing and restore luminal diameter (Correct answer)
It delivers localized thermal energy to dissolve atherosclerotic deposits

Correct answer: It is inflated within a stenotic vessel segment to mechanically dilate the narrowing and restore luminal diameter

PTA uses high-pressure balloon inflation to compress atherosclerotic plaque against the vessel wall and plastically deform the artery, increasing luminal diameter without surgical incision.

Question 84: For an AP erect abdomen radiograph, what is the recommended vertical centering point for the central ray to ensure the diaphragm is included?

Midway between the xiphoid process and iliac crest
At the level of the xiphoid process
Approximately 5 cm superior to the iliac crest (Correct answer)
At the level of the iliac crest

Correct answer: Approximately 5 cm superior to the iliac crest

To ensure the diaphragm is included on an AP erect abdomen, the central ray should be directed horizontally to the midsagittal plane and vertically approximately 5 cm (2 inches) superior to the level of the iliac crests. This higher centering is crucial for detecting free intraperitoneal air (pneumoperitoneum), a primary indication for this projection.

Question 85: How can internationally educated technologists obtain certification with CAMRT?

Apply directly for certification.
Undergo credential assessment and meet equivalency requirements. (Correct answer)
Complete a Canadian residency program.
Provide proof of work experience in radiology.

Correct answer: Undergo credential assessment and meet equivalency requirements.

Internationally educated technologists (IETs) must first undergo a credential assessment by CAMRT to determine if their foreign qualifications are equivalent to Canadian standards. If deemed equivalent, they must then meet any additional requirements, such as passing the certification exam. This process ensures IETs meet the same rigorous professional standards as Canadian-educated technologists.

Question 86: How do the Standards address documentation?

Only abnormal findings
Documentation is optional
Complete, accurate, timely documentation of all examination information is required (Correct answer)
Radiologist responsibility only

Correct answer: Complete, accurate, timely documentation of all examination information is required

Thorough documentation is a professional standard including all examination details.

Question 87: What is a primary eligibility criterion for CAMRT membership?

Completion of an accredited medical radiation technology program. (Correct answer)
Two years of work experience in medical imaging.
Holding a degree in any science field.
Completion of a general healthcare certification.

Correct answer: Completion of an accredited medical radiation technology program.

A primary eligibility criterion for CAMRT membership and certification is the successful completion of a medical radiation technology program. This program must be accredited by a recognized body, such as Accreditation Canada. This ensures that candidates have received a standardized and high-quality education that meets national professional standards.

Question 88: An MRT is performing a CT scan of the head. The resulting axial images show dark, streak-like artifacts and a 'cupping' artifact where the central portion of the brain parenchyma appears artificially dark. This is most characteristic of:

Motion artifact
Beam hardening artifact (Correct answer)
Partial volume averaging
Ring artifact

Correct answer: Beam hardening artifact

Beam hardening artifacts occur because a polychromatic x-ray beam becomes 'harder' (higher average energy) as it passes through dense objects like the skull, as lower-energy photons are preferentially absorbed. This differential absorption is not fully corrected by standard reconstruction algorithms, leading to characteristic dark streaks and 'cupping' where the center of a uniform object appears less dense than its periphery.

Question 89: During a fluoroscopic procedure, where should the operator and other staff position themselves to minimize their exposure to scatter radiation?

As close to the X-ray tube as possible to monitor the equipment.
Directly behind the radiologist, regardless of their position.
On the side of the patient where the image receptor (image intensifier or flat-panel detector) is located. (Correct answer)
On the side of the patient where the X-ray tube is located.

Correct answer: On the side of the patient where the image receptor (image intensifier or flat-panel detector) is located.

The patient is the primary source of scatter radiation. The highest intensity of scatter radiation is on the side where the X-ray beam enters the patient (the tube side). The image receptor absorbs a significant portion of the primary beam, resulting in lower scatter on that side. Therefore, standing on the image receptor side significantly reduces occupational dose.

Question 90: A 16-year-old patient arrives for a chest X-ray to rule out pneumonia. They are legally considered a minor. According to Canadian healthcare consent principles, who should provide consent for the procedure?

Only the patient's parent or legal guardian can provide consent.
The patient can provide consent if they are deemed to have the capacity to understand the nature and consequences of the procedure. (Correct answer)
The referring physician's order is sufficient and serves as consent.
Consent is not required because it is a routine, low-risk procedure.

Correct answer: The patient can provide consent if they are deemed to have the capacity to understand the nature and consequences of the procedure.

In Canada, the principle of a 'mature minor' applies. There is no specific age of consent for medical treatment. A minor who has the capacity to understand the relevant information (nature of the treatment, risks, benefits, alternatives) and appreciate the reasonably foreseeable consequences of a decision can give valid consent.

Question 91: What is the correct positioning for a lateral chest radiograph?

One arm raised, one at side
Both arms at sides, facing detector
Arms crossed, right side against detector
Arms raised or held forward, left side against detector, true lateral alignment (Correct answer)

Correct answer: Arms raised or held forward, left side against detector, true lateral alignment

Left side against detector minimizes cardiac magnification, arms out of the thoracic field.

Question 92: What is the purpose of the 10-day and 28-day rules for female patients?

Specify waiting periods before conception
Specify maximum pregnancy dose
Define waiting periods between exams
Guide timing of non-urgent pelvic imaging to minimize irradiating an early pregnancy (Correct answer)

Correct answer: Guide timing of non-urgent pelvic imaging to minimize irradiating an early pregnancy

These rules guide scheduling when pregnancy is least likely.

Question 93: What is the function of a lookup table (LUT) in digital image processing?

Maps raw pixel values to display grayscale values (Correct answer)
Calculates patient dose
Corrects geometric distortion
Stores tube calibration data

Correct answer: Maps raw pixel values to display grayscale values

LUTs transform raw detector values into optimal display brightness and contrast.

Question 94: In digital radiography, what is the primary purpose of applying a look-up table (LUT) during image processing?

To select the appropriate kVp and mAs for the examination
To calculate the patient's effective dose from the exposure
To map raw pixel data to specific brightness and contrast levels for display (Correct answer)
To reduce geometric unsharpness caused by the focal spot size

Correct answer: To map raw pixel data to specific brightness and contrast levels for display

A look-up table (LUT) is a post-processing tool that translates the raw numerical pixel values from the detector into specific grayscale values for display on a monitor. Each LUT is designed to provide the optimal brightness and contrast for a specific anatomical part, ensuring consistent image presentation regardless of minor exposure variations.

Question 95: To minimize the risk of contrast-associated acute kidney injury (CA-AKI) in a high-risk outpatient, which of the following laboratory values is the most important to assess before administering intravenous iodinated contrast?

Hematocrit
Blood Urea Nitrogen (BUN)
International Normalized Ratio (INR)
Estimated Glomerular Filtration Rate (eGFR) (Correct answer)

Correct answer: Estimated Glomerular Filtration Rate (eGFR)

The estimated Glomerular Filtration Rate (eGFR) is the most accurate and reliable measure of kidney function used to stratify the risk of CA-AKI. While serum creatinine is used to calculate eGFR, the eGFR itself accounts for variables like age, sex, and race, providing a more comprehensive assessment. Canadian guidelines use eGFR thresholds (e.g., <30 mL/min/1.73 m²) to identify high-risk patients who may require specific precautions. BUN, INR, and hematocrit are not primary indicators of renal function for this purpose.

Question 96: A patient requests their imaging report. What are the technologist obligations under Canadian privacy law?

Provide the report immediately from RIS/PACS
Inform the patient of their right to access and direct them to the proper process (Correct answer)
Reports are confidential and cannot be shared
They must get the report from their physician

Correct answer: Inform the patient of their right to access and direct them to the proper process

Canadian privacy legislation gives patients the right to access their health information.

Question 97: What regulatory standard governs diagnostic X-ray equipment safety in Canada?

CSA Z462
ISO 9001
CAN/CSA-C22.2
Health Canada Radiation Emitting Devices Act and Safety Code 35 (Correct answer)

Correct answer: Health Canada Radiation Emitting Devices Act and Safety Code 35

REDA and Safety Code 35 establish the Canadian regulatory framework.

Question 98: What is the appropriate action when contrast extravasation is detected during power injection?

Continue at slower rate
Apply a tourniquet
Withdraw contrast with a syringe
Stop immediately, elevate the limb, apply cold compress (Correct answer)

Correct answer: Stop immediately, elevate the limb, apply cold compress

Stop the injection, elevate the limb, and apply cold compresses to reduce swelling.

Question 99: Which positioning error causes the intervertebral disk spaces to appear narrowed or closed on a lateral lumbar spine radiograph?

Excessive rotation of the patient
Insufficient collimation
The spine not being parallel to the IR (Correct answer)
Incorrect kVp selection

Correct answer: The spine not being parallel to the IR

If the lumbar spine is not parallel to the IR (often due to hip width differences), the diverging beam causes disk spaces to appear narrowed; a foam wedge under the waist corrects this.

Question 100: A colleague routinely uses exposure parameters significantly above department protocols. What action?

Ignore the situation
Immediately report to provincial authority
Post a protocol reminder
Speak with the colleague first, then report to QA lead if it continues (Correct answer)

Correct answer: Speak with the colleague first, then report to QA lead if it continues

Progressive intervention: direct communication first, then escalation to QA/supervisor if behaviour persists.

Question 101: What are the key steps of the Seldinger technique for vascular access in interventional radiology?

Needle puncture of vessel, guidewire insertion through needle, needle removal, catheter advancement over guidewire (Correct answer)
Surgical anastomosis of catheter directly to vessel wall
Transvenous approach using a long sheath without a needle
Cut-down onto the vessel, direct catheter insertion, suture closure

Correct answer: Needle puncture of vessel, guidewire insertion through needle, needle removal, catheter advancement over guidewire

The Seldinger technique uses a guidewire as an intermediary: the vessel is punctured with a needle, a flexible guidewire is inserted through the needle lumen, the needle is withdrawn, and a catheter is then threaded over the guidewire into the vessel.

Question 102: What is the ethical basis for ALARA?

Beneficence (doing good) and non-maleficence (do no harm) balanced with diagnostic quality (Correct answer)
Economic efficiency
Legal liability avoidance only
Technical guideline without ethical foundations

Correct answer: Beneficence (doing good) and non-maleficence (do no harm) balanced with diagnostic quality

ALARA is rooted in the bioethical principles of beneficence and non-maleficence.

Question 103: Which combination of radiation protection measures is most important for the interventional radiologist who must stand near the patient during fluoroscopic-guided procedures?

Positioning the X-ray tube above the table to increase tube-to-patient distance
Limiting total procedure time to exactly 5 minutes regardless of clinical need
Using the highest possible kVp to reduce procedure time
Wearing a full lead apron, thyroid collar, and leaded glasses, and maximizing distance from the beam when possible (Correct answer)

Correct answer: Wearing a full lead apron, thyroid collar, and leaded glasses, and maximizing distance from the beam when possible

Because interventionalists work in close proximity to the scatter source, comprehensive personal shielding (lead apron ≥0.5 mm Pb, thyroid collar, leaded glasses) combined with distance maximization are the primary occupational dose control measures.

Question 104: Which joint type is found at the knee and allows flexion and extension movements?

Gliding joint
Ball-and-socket joint
Hinge joint (Correct answer)
Pivot joint

Correct answer: Hinge joint

The knee is primarily a hinge joint (ginglymus), allowing flexion and extension in one primary plane of motion.

Question 105: Which of the following palpable anatomical landmarks is the most commonly used and reliable for centering a routine supine AP abdomen radiograph?

Pubic symphysis
Anterior Superior Iliac Spine (ASIS)
Xiphoid process
Iliac crest (Correct answer)

Correct answer: Iliac crest

The iliac crest is the most common and reliable landmark for centering a supine AP abdomen (KUB) radiograph. Centering the central ray to the midsagittal plane at the level of the iliac crests typically ensures that the resulting image includes the required anatomy, from the diaphragm to the pubic symphysis.

Question 106: Which positioning term describes the patient lying face down on the radiographic table?

Prone (Correct answer)
Trendelenburg
Supine
Lateral recumbent

Correct answer: Prone

Prone positioning places the patient face down, with the anterior surface of the body against the table.

Question 107: Which of the following is a core principle of 'Acting with Professional Integrity' as outlined in the CAMRT Member Code of Ethics and Professional Conduct?

Engaging in lifelong learning to maintain competence.
Advocating for the most appropriate care for patients.
Performing only the procedures for which the MRT has acquired competence.
Ensuring all professional activities are appropriate and not a conflict of interest. (Correct answer)

Correct answer: Ensuring all professional activities are appropriate and not a conflict of interest.

While competence, patient advocacy, and lifelong learning are all crucial ethical principles for an MRT, ensuring activities are free from conflict of interest falls directly under the specific CAMRT principle of 'Acting with Professional Integrity'. This principle also includes being accountable, treating persons with respect, and complying with laws.

Question 108: What are the essential elements of informed consent for contrast-enhanced examinations?

Patient understands the procedure, risks, benefits, alternatives, and has had opportunity to ask questions (Correct answer)
Verbal agreement is sufficient
Only the patient signature
Physician consent is sufficient

Correct answer: Patient understands the procedure, risks, benefits, alternatives, and has had opportunity to ask questions

Informed consent requires understanding of procedure, risks, benefits, and alternatives.

Question 109: What is the typical entrance skin dose rate range during standard fluoroscopy?

500–1000 mGy/min
1–10 mGy/min (Correct answer)
0.01–0.1 mGy/min
50–100 mGy/min

Correct answer: 1–10 mGy/min

Standard fluoroscopy delivers entrance skin dose rates of approximately 1–10 mGy/min, though high-dose-rate fluoroscopy modes can exceed this range.

Question 110: What is the purpose of the wire mesh test in mammography QC?

Measure radiation output
Calculate average glandular dose
Evaluate screen-film contact or detector uniformity (Correct answer)
Assess compression paddle accuracy

Correct answer: Evaluate screen-film contact or detector uniformity

The mesh test identifies areas of non-uniform image quality.

Question 111: In CT quality control, what does the daily water phantom HU measurement test?

Tube output consistency only
CT number accuracy and scanner calibration (Correct answer)
Spatial resolution of the detector
Gantry tilt accuracy

Correct answer: CT number accuracy and scanner calibration

Scanning a water phantom daily and confirming its HU value is near 0 (±5 HU) verifies CT number accuracy and proper scanner calibration.

Question 112: During a double-contrast barium enema, which patient position is used to allow barium to flow from the sigmoid colon into the cecum?

Reverse Trendelenburg
Left lateral decubitus
Right lateral decubitus (Correct answer)
Prone position

Correct answer: Right lateral decubitus

The right lateral decubitus position uses gravity to direct barium flow from the descending colon and sigmoid into the cecum, which lies in the right lower quadrant.

Question 113: An anxious, claustrophobic patient arrives for imaging. What is the most appropriate initial response?

Refer for sedation immediately
Acknowledge their anxiety, explain the procedure, and discuss coping strategies (Correct answer)
Tell them not to worry
Proceed quickly to minimize distress

Correct answer: Acknowledge their anxiety, explain the procedure, and discuss coping strategies

Acknowledging feelings and providing information with coping strategies demonstrates patient-centred care.

Question 114: What is CAMRT role in federal-level advocacy?

Limited to salary negotiations
Represents the profession in federal health policy discussions and regulatory consultations (Correct answer)
No advocacy role
Only advocates for exam changes

Correct answer: Represents the profession in federal health policy discussions and regulatory consultations

CAMRT represents MRTs in federal policy discussions and national healthcare initiatives.

Question 115: What is the CAMRT position on the technologist role in patient education?

Professional responsibility to educate about the procedure, radiation safety, and preparation within scope (Correct answer)
Should not provide medical information
Exclusively physician responsibility
Only scheduling and logistics questions

Correct answer: Professional responsibility to educate about the procedure, radiation safety, and preparation within scope

Patient education is a core CAMRT competency within the MRT scope of practice.

Question 116: An MRI technologist observes a series of sharp, linear artifacts across an image, perpendicular to the frequency encoding direction. The artifact disappears after the technologist ensures the scanner room door is fully sealed. This phenomenon is known as a:

Zipper artifact (Correct answer)
Motion artifact
Chemical shift artifact
Aliasing artifact

Correct answer: Zipper artifact

A zipper artifact is caused by extraneous radiofrequency (RF) signals leaking into the scan room and interfering with the MR signal. These artifacts often appear as a line or series of lines across the image. A common cause for this leak is an improperly sealed scanner room door, which is part of the room's RF shielding.

Question 117: How often must CAMRT members renew to maintain active certification?

Every 6 months
Annually (Correct answer)
Every 2 years
Every 5 years

Correct answer: Annually

Membership must be renewed annually.

Question 118: How does CAMRT support members transitioning between practice settings?

Automatic provincial registration transfer
Career resources, mentorship, relevant CPD activities, and scope of practice guidance (Correct answer)
No support provided
New certification required per setting

Correct answer: Career resources, mentorship, relevant CPD activities, and scope of practice guidance

CAMRT supports transitions through career resources, mentorship, CPD, and practice guidance.

Question 119: CT images show a ring artefact. What is the most likely cause?

Patient motion
Metal implant
Wrong reconstruction algorithm
Miscalibrated or defective detector element (Correct answer)

Correct answer: Miscalibrated or defective detector element

A faulty detector element gives consistently incorrect readings, tracing a ring as the gantry rotates.

Question 120: Which of the following radiographic positions is specifically designed to demonstrate a small, free-flowing pleural effusion in a patient who is unable to stand?

Dorsal decubitus
AP axial lordotic
Lateral decubitus (Correct answer)
Ventral decubitus

Correct answer: Lateral decubitus

A lateral decubitus projection, with a horizontal x-ray beam, is the primary method for demonstrating fluid in the pleural cavity (pleural effusion) for non-ambulatory patients. To visualize the fluid, the patient is positioned to lie on the affected side, allowing the fluid to layer out along the dependent lateral chest wall.

Question 121: What is the purpose of the DLP (Dose-Length Product) metric in CT?

Defines the maximum allowable slice thickness
Estimates total energy imparted to the patient over the entire scan length (Correct answer)
Measures spatial resolution of the CT system
Calculates effective dose directly

Correct answer: Estimates total energy imparted to the patient over the entire scan length

DLP (CTDIvol × scan length in cm) estimates the total radiation energy delivered during a CT examination and is used to compare doses across protocols.

Question 122: A patient develops urticaria (hives), pruritus (itching), and mild bronchospasm minutes after receiving intravenous iodinated contrast media. This type of reaction is best classified as:

Vasovagal
Chemotoxic
Idiosyncratic (Anaphylactoid) (Correct answer)
Pyrogenic

Correct answer: Idiosyncratic (Anaphylactoid)

This constellation of symptoms—hives, itching, and bronchospasm—is characteristic of an idiosyncratic, or anaphylactoid, reaction. These reactions are not dose-dependent and resemble a true allergic reaction (anaphylaxis) but are not typically mediated by IgE antibodies. Chemotoxic reactions are dose-dependent effects like heat or nausea. Vasovagal reactions involve a drop in heart rate and blood pressure. Pyrogenic reactions are caused by contaminants and result in fever.

Question 123: A 14-year-old athlete presents with localized pain and swelling over the tibial tuberosity. Osgood-Schlatter disease is suspected. Besides the standard AP projection, which view is most essential for diagnosing this condition?

Lateral view of the knee (Correct answer)
Tangential view of the patella (sunrise/skyline)
Medial oblique of the knee
Intercondylar fossa view (tunnel view)

Correct answer: Lateral view of the knee

Osgood-Schlatter disease is a traction apophysitis of the tibial tuberosity. A lateral projection of the knee provides a clear profile of the tuberosity and the insertion of the patellar tendon. This view is best for visualizing characteristic findings such as soft tissue swelling, fragmentation, or prominence of the apophysis.

Question 124: A physician orders an acute abdominal series on a patient who is too ill to stand. To assess for free intraperitoneal air, which projection best replaces the standard erect abdomen view?

AP supine abdomen with a 15-degree cephalic angle
Right lateral decubitus abdomen
Left lateral decubitus abdomen (Correct answer)
Dorsal decubitus abdomen

Correct answer: Left lateral decubitus abdomen

When a patient cannot stand for an erect abdomen, the left lateral decubitus projection is the standard substitute for detecting free intraperitoneal air. Placing the patient on their left side allows free air to rise and be visualized superiorly, against the homogenous density of the liver, and away from the gastric bubble.

Question 125: What is the osmolality classification of iohexol (Omnipaque)?

Ultra-low-osmolality for paediatric use
High-osmolality
Iso-osmolality for intrathecal use only
Low-osmolality with fewer adverse reactions than HOCM (Correct answer)

Correct answer: Low-osmolality with fewer adverse reactions than HOCM

Iohexol is a non-ionic, low-osmolality contrast medium with significantly fewer adverse reactions.

Question 126: An MRT performs a portable chest x-ray using a focused grid. The resulting image demonstrates severe grid cut-off on both lateral edges, while the central portion of the image is properly exposed. What is the most likely cause of this artifact?

The grid was placed upside-down (Correct answer)
An off-center grid error
An off-level grid error
The SID was outside the grid's focal range

Correct answer: The grid was placed upside-down

A focused grid has its lead strips angled to match the divergence of the x-ray beam at a specific SID range. If the grid is placed upside-down, the strips are angled in opposition to the beam's divergence. This causes the primary beam to be absorbed at the periphery, resulting in severe bilateral cut-off, while only the central, most perpendicular rays can pass through to the detector.

Question 127: What is the inverse square law in radiation protection?

Intensity decreases with the square of distance; doubling distance reduces exposure to one-quarter (Correct answer)
Intensity doubles when distance halves
Only applies to radioactive sources
Intensity decreases linearly with distance

Correct answer: Intensity decreases with the square of distance; doubling distance reduces exposure to one-quarter

Doubling the distance reduces exposure to 25%.

Question 128: CT QC shows water measures consistently +8 HU instead of 0. What is the significance?

Tube nearing end of life
Calibration drift affecting diagnostic accuracy; recalibration needed (Correct answer)
Detector array needs replacement
Within normal limits

Correct answer: Calibration drift affecting diagnostic accuracy; recalibration needed

Water accuracy should be 0 plus or minus 4 HU. +8 HU indicates systematic drift.

Question 129: What does focal spot size affect, and how is it measured during QC?

Spatial resolution and sharpness; star pattern or slit camera (Correct answer)
Patient dose; ionization chamber
Detector efficiency; flat-field exposure
Image contrast; contrast-detail phantom

Correct answer: Spatial resolution and sharpness; star pattern or slit camera

Focal spot size affects geometric unsharpness and resolution, measured with star patterns or slit cameras.

Question 130: What is the primary mechanism by which iodinated contrast enhances CT images?

Emits radiation detected by CT detectors
Causes tissue fluorescence
Attenuates X-rays due to iodine high atomic number (Correct answer)
Increases magnetic susceptibility

Correct answer: Attenuates X-rays due to iodine high atomic number

Iodine (Z=53) causes significant X-ray attenuation through photoelectric absorption.

Question 131: What are the Canadian C-Spine Rules and how do they differ from NEXUS?

Only for paediatric patients
Quality standards for image evaluation
Identical screening tools
Stepwise clinical decision tool with higher specificity than NEXUS, incorporating mechanism of injury and range-of-motion testing (Correct answer)

Correct answer: Stepwise clinical decision tool with higher specificity than NEXUS, incorporating mechanism of injury and range-of-motion testing

CCR uses a three-step algorithm achieving higher specificity while maintaining sensitivity.

Question 132: What is detective quantum efficiency (DQE)?

Ability to produce uniform images
Maximum spatial resolution
Speed of image readout
Efficiency of converting X-ray photons into useful signal relative to noise (Correct answer)

Correct answer: Efficiency of converting X-ray photons into useful signal relative to noise

DQE measures how efficiently a detector converts X-ray photons into signal while preserving SNR.

Question 133: A patient discloses possible pregnancy before an abdominal X-ray. What should the technologist do?

Stop, document the disclosure, consult the radiologist (Correct answer)
Perform with gonadal shielding only
Proceed since the physician assessed them
Ask patient to sign a waiver

Correct answer: Stop, document the disclosure, consult the radiologist

Stop and consult the radiologist when pregnancy is possible due to fetal radiation risks.

Question 134: What infection prevention measures apply when imaging a patient on contact precautions?

Gloves only during direct contact
PPE (gown, gloves minimum), disinfect equipment, hand hygiene, appropriate scheduling (Correct answer)
Standard precautions sufficient
Refuse until cleared from isolation

Correct answer: PPE (gown, gloves minimum), disinfect equipment, hand hygiene, appropriate scheduling

Contact precautions require PPE, equipment disinfection, hand hygiene, and scheduling considerations.

Question 135: What special radiation protection considerations apply for paediatric patients?

No special considerations
Children are more radiosensitive; optimize technique for smaller body, careful collimation, dose optimization (Correct answer)
No protection needed; dose already low
Only reduce exposure time

Correct answer: Children are more radiosensitive; optimize technique for smaller body, careful collimation, dose optimization

Children are more radiosensitive with longer post-exposure lifespan, requiring enhanced protection.

Question 136: What is the Towne projection of the skull?

AP with chin elevated; facial bones
AP axial with 30-degree caudal angle through foramen magnum; occipital bone, petrous ridges, dorsum sellae (Correct answer)
Lateral; sella turcica
Submentovertex; skull base

Correct answer: AP axial with 30-degree caudal angle through foramen magnum; occipital bone, petrous ridges, dorsum sellae

AP axial with 30-degree caudal angle demonstrates posterior fossa structures.

Question 137: A fluoroscopy unit ABC is increasing kVp beyond limits. What is the likely cause?

Collimator too wide
Grid removed
Degraded image intensifier input phosphor (Correct answer)
Patient too close to receptor

Correct answer: Degraded image intensifier input phosphor

II input phosphor degradation reduces conversion efficiency, causing ABC to compensate by increasing technique.

Question 138: In CT, pitch is defined as:

The number of detector rows
The tube current in milliamperes
Table distance traveled per gantry rotation divided by beam collimation (Correct answer)
The thickness of a single CT slice

Correct answer: Table distance traveled per gantry rotation divided by beam collimation

Pitch = table feed per rotation ÷ total beam collimation; a pitch >1 means faster coverage but can reduce dose and slice overlap.

Question 139: How do PA and oblique projections of the hand differ?

PA is flat on detector; oblique at 45-degree rotation separating the metacarpals (Correct answer)
No differences
Oblique uses different central ray angle only
Oblique is same as PA with fingers spread

Correct answer: PA is flat on detector; oblique at 45-degree rotation separating the metacarpals

The 45-degree oblique separates overlapping metacarpals.

Question 140: Which lab value must be checked before giving iodinated contrast to a diabetic patient on metformin?

Liver function tests
Estimated glomerular filtration rate (eGFR) (Correct answer)
Blood glucose
Complete blood count

Correct answer: Estimated glomerular filtration rate (eGFR)

eGFR is checked because contrast-induced kidney injury could impair metformin clearance, risking lactic acidosis.

Question 141: In CT imaging, what does the term 'Hounsfield unit (HU)' measure?

The speed of image reconstruction
The attenuation value of tissue relative to water (Correct answer)
Radiation dose to the patient
The collimator aperture width

Correct answer: The attenuation value of tissue relative to water

Hounsfield units quantify the x-ray attenuation of a tissue relative to water (0 HU), with air at −1000 HU and dense bone at +1000 HU.

Question 142: In digital subtraction angiography (DSA), what is a 'mask' image and how is it used?

A pre-contrast baseline image electronically subtracted from contrast-filled frames, leaving only opacified vessels visible (Correct answer)
A post-processing filter that enhances vessel edge sharpness
A lead shield placed over the image intensifier to reduce off-axis scatter
A protective cover for the flat-panel detector during fluoroscopy

Correct answer: A pre-contrast baseline image electronically subtracted from contrast-filled frames, leaving only opacified vessels visible

The mask is a pre-contrast image acquired immediately before contrast injection; it is logarithmically subtracted from each subsequent contrast frame so that bones and soft tissues cancel out, leaving only the contrast-filled vascular structures.

Question 143: Why is a sponge placed under the waist for lateral lumbar spine imaging?

Centering landmark
Patient comfort only
Reduces radiation dose
Aligns the lumbar spine parallel to the detector for uniform vertebral height and open disc spaces (Correct answer)

Correct answer: Aligns the lumbar spine parallel to the detector for uniform vertebral height and open disc spaces

The sponge corrects the natural waist concavity to prevent spinal sagging.

Question 144: A technologist believes an ordered examination may be unnecessary. What are the ethical responsibilities?

Perform but file complaint against physician
Exercise judgment, communicate concerns to the radiologist, advocate for the patient best interest (Correct answer)
Perform without question
Refuse and send patient home

Correct answer: Exercise judgment, communicate concerns to the radiologist, advocate for the patient best interest

Professional judgment, consultation with radiologist, and patient advocacy are required.

Question 145: When performing an AP projection of the hip on an ambulatory adult patient, what is the correct positioning of the patient's foot and lower leg to place the femoral neck parallel to the image receptor?

Invert the foot 15-20 degrees internally. (Correct answer)
Evert the foot 15-20 degrees externally.
Plantar flex the foot as much as possible.
Place the foot in a neutral, dorsiflexed position.

Correct answer: Invert the foot 15-20 degrees internally.

To compensate for the natural anteversion of the femoral neck, the entire lower limb must be medially (internally) rotated 15 to 20 degrees. This maneuver places the femoral neck parallel to the image receptor, demonstrating it in true profile without foreshortening, and minimizes the visibility of the lesser trochanter.

Question 146: What role does continuing education play in maintaining ethical standards?

It keeps technologists updated on ethical and legal standards. (Correct answer)
It helps in obtaining promotions.
It focuses on technical skills alone.
It eliminates the need for annual evaluations.

Correct answer: It keeps technologists updated on ethical and legal standards.

Continuing education is vital for medical radiation technologists to stay informed about evolving ethical guidelines, legal requirements, and best practices in their field. This ongoing learning ensures they can consistently apply current ethical standards to their practice, adapt to new challenges, and provide the highest quality of patient care.

Question 147: A trauma patient is brought in on a backboard following a high-speed motor vehicle collision. The initial request is for a portable pelvis radiograph to rule out a fracture. Which of the following projections is performed first and requires no manipulation of the patient's lower limbs?

Judet View (Oblique)
AP Pelvis (Correct answer)
Taylor Method (Outlet View)
AP Axial Inlet View

Correct answer: AP Pelvis

In a trauma setting, the AP pelvis projection is the primary initial view. It is performed without any patient manipulation, such as rotating the limbs, to prevent the displacement of potentially unstable fractures. This single projection provides a crucial overview of the entire pelvic girdle and is a standard part of the initial trauma survey.

Question 148: What are the key positioning elements for an AP pelvis radiograph?

Centre at iliac crest; hips flexed
Centre at umbilicus; no special positioning
Centre at symphysis; external rotation
Centre between ASIS and symphysis pubis; feet internally rotated 15-20 degrees; verify symmetric ASIS positioning (Correct answer)

Correct answer: Centre between ASIS and symphysis pubis; feet internally rotated 15-20 degrees; verify symmetric ASIS positioning

Internal foot rotation compensates for femoral neck anteversion, showing necks in full length.

Question 149: A digital radiograph of a knee appears excessively noisy and grainy. The exposure indicator (EI) is significantly below the target range. Which of the following is the most likely cause for this appearance?

Excessive Object-to-Image Distance (OID)
Incorrect look-up table (LUT) applied
Use of a high-ratio grid
Insufficient mAs (Correct answer)

Correct answer: Insufficient mAs

A grainy or noisy appearance, known as quantum mottle, is caused by an insufficient number of x-ray photons reaching the detector. The mAs setting directly controls the quantity of photons produced. A low exposure indicator value confirms that the detector received inadequate exposure, which is most commonly due to insufficient mAs.

Question 150: What is the annual effective dose limit for a member of the general public in Canada, as specified in the Radiation Protection Regulations?

1 mSv (Correct answer)
20 mSv
5 mSv
0.1 mSv

Correct answer: 1 mSv

The Canadian Nuclear Safety Commission's (CNSC) Radiation Protection Regulations set the effective dose limit for the public at 1 mSv in one calendar year.

Question 151: What is the linear no-threshold (LNT) model?

Any radiation dose carries proportional stochastic risk with no safe threshold; basis of dose limits and ALARA (Correct answer)
Only applies to therapy
Disproven and no longer used
Effects only occur above a threshold

Correct answer: Any radiation dose carries proportional stochastic risk with no safe threshold; basis of dose limits and ALARA

LNT assumes linear dose-risk relationship with no threshold, forming the basis of protection policy.

Question 152: Annual QC testing shows the X-ray tube HVL is below acceptable minimum. What does this indicate?

Tube output too high
Insufficient beam filtration increasing patient skin dose (Correct answer)
Collimator misalignment
Focal spot too large

Correct answer: Insufficient beam filtration increasing patient skin dose

Low HVL indicates inadequate filtration, allowing too many low-energy photons that increase skin dose.

Question 153: What does the CAMRT Code of Ethics say about professional boundaries with patients?

Only applies to physicians
Members must maintain boundaries protecting patients from exploitation and maintaining trust (Correct answer)
Boundaries mean being impersonal
Only important with paediatric patients

Correct answer: Members must maintain boundaries protecting patients from exploitation and maintaining trust

Boundaries prevent exploitation of the healthcare power imbalance.

Question 154: What is the relationship between CAMRT and provincial regulatory standards?

Identical documents
National professional standards complementing provincial regulatory standards, both applying to practitioners (Correct answer)
Provincial always supersede
CAMRT only for members, provincial for others

Correct answer: National professional standards complementing provincial regulatory standards, both applying to practitioners

They are complementary, sharing principles while potentially addressing different aspects.

Question 155: What preparation is required for an upper GI series with barium?

Drink 1 litre of water before
NPO 6-8 hours and no smoking or gum chewing (Correct answer)
No preparation
Laxative bowel prep

Correct answer: NPO 6-8 hours and no smoking or gum chewing

Fasting ensures an empty stomach for proper barium mucosal coating.

Question 156: Which positioning landmark is palpated to locate C7 for cervical spine radiography?

Acromion
Vertebra prominens (Correct answer)
Gonion
Mastoid tip

Correct answer: Vertebra prominens

The vertebra prominens (C7) has the most prominent spinous process in the cervical region and is easily palpated at the base of the neck.

Question 157: According to current Canadian guidelines and the position of the CAMRT, what is the recommended practice regarding gonadal shielding for most routine diagnostic X-ray procedures?

It must be used for all patients of reproductive age.
It is mandatory only when the gonads are within 5 cm of the primary beam.
It is no longer recommended for routine use due to advancements in technology and the potential to obscure anatomy or interfere with automatic exposure control. (Correct answer)
It should only be used for pediatric patients and pregnant patients.

Correct answer: It is no longer recommended for routine use due to advancements in technology and the potential to obscure anatomy or interfere with automatic exposure control.

Major Canadian and international bodies, supported by the CAMRT, no longer recommend the routine use of patient gonadal shielding. Modern equipment uses significantly lower doses, and shields can obscure relevant anatomy, interfere with automatic exposure control (potentially increasing dose), and provide minimal benefit due to the low risk from internal scatter.

Question 158: In percutaneous nephrostomy, which anatomical approach and calyceal target are preferred to minimize vascular injury?

Anterior abdominal approach targeting the renal pelvis directly
Transureteral approach via cystoscopy
Lateral flank approach targeting the renal cortex mid-pole
Posterior flank approach targeting a posterior calyx, typically in the lower pole (Correct answer)

Correct answer: Posterior flank approach targeting a posterior calyx, typically in the lower pole

The posterior flank approach targets a posterior calyx (usually lower pole) because posterior calyces lie in the avascular plane of Brödel between the anterior and posterior segmental arteries, minimizing risk of hemorrhage.

Question 159: Which anatomical plane divides the body into equal right and left halves?

Coronal plane
Midsagittal plane (Correct answer)
Oblique plane
Transverse plane

Correct answer: Midsagittal plane

The midsagittal (median) plane divides the body into equal right and left halves along the midline.

Question 160: What does signal-to-noise ratio (SNR) measurement indicate about detector performance?

Maximum pixel utilization
Image acquisition speed
Response uniformity across the surface
Ratio of useful information to random fluctuations (Correct answer)

Correct answer: Ratio of useful information to random fluctuations

SNR quantifies the ratio of meaningful signal to noise, indicating image quality potential.

Question 161: A CT patient has an IV infusion through their only accessible vein. What should the technologist do?

Coordinate with nursing to assess options including pausing infusion, different site, or using existing line (Correct answer)
Cancel the CT scan
Remove the infusion and use the vein
Inject through the line without consulting nursing

Correct answer: Coordinate with nursing to assess options including pausing infusion, different site, or using existing line

Coordinate with nursing staff to safely manage competing IV access needs.

Question 162: A patient is sent to the imaging department for a chest x-ray to rule out a small pneumothorax on the right side. In addition to the standard PA inspiration view, which of the following projections would be MOST beneficial to demonstrate this condition?

Left lateral decubitus
AP Lordotic
PA expiration (Correct answer)
Right lateral decubitus

Correct answer: PA expiration

A PA expiration chest x-ray is valuable for demonstrating a small pneumothorax. During expiration, the volume of the lungs decreases, which increases the relative density of the lung tissue. This makes the collection of free air in the pleural space (pneumothorax) more conspicuous and easier to visualize compared to the standard full inspiration view.

Question 163: Which combination of geometric factors will result in the highest degree of image unsharpness (penumbra)?

Large focal spot, long SID, short OID
Large focal spot, short SID, long OID (Correct answer)
Small focal spot, long SID, short OID
Small focal spot, short SID, long OID

Correct answer: Large focal spot, short SID, long OID

Geometric unsharpness, or penumbra, is the blurring at the edges of a structure. It is maximized by using a large focal spot, a short source-to-image distance (SID), and a long object-to-image distance (OID). Each of these factors increases the divergence of the x-ray beam as it passes the edge of the object, creating a larger, more poorly defined shadow on the detector.

Question 164: How does AEC function differently with digital detectors versus film-screen?

AEC is only a backup with digital
AEC still controls exposure termination but targets optimal detector exposure (EI) rather than optical density (Correct answer)
AEC operates identically
AEC is not needed with digital detectors

Correct answer: AEC still controls exposure termination but targets optimal detector exposure (EI) rather than optical density

AEC targets optimal EI rather than film optical density, but the wide latitude can mask errors.

Question 165: What causes ghosting artefact in CR?

Incomplete erasure of a previously exposed plate (Correct answer)
Patient breathing
Electromagnetic interference
Software processing errors

Correct answer: Incomplete erasure of a previously exposed plate

Residual energy from a previous exposure remains due to incomplete erasure.

Question 166: A digital radiograph is excessively noisy. Which adjustment most effectively reduces quantum noise?

Decrease source-to-image distance
Increase kVp by 15%
Use a smaller focal spot
Double the mAs (Correct answer)

Correct answer: Double the mAs

Doubling mAs doubles the photon count, reducing noise by the square root of 2.

Question 167: During an upper GI series, which contrast agent should be used when bowel perforation is suspected?

Air contrast (double contrast) alone
Water-soluble iodinated contrast medium (Correct answer)
Low-density barium paste
High-density barium sulfate suspension

Correct answer: Water-soluble iodinated contrast medium

Water-soluble iodinated contrast is used when perforation is suspected because barium sulfate in the peritoneal cavity causes severe granulomatous peritonitis; iodinated agents are absorbed and excreted safely.

Question 168: What is the primary safety concern with portable X-ray equipment on hospital wards?

Equipment falling on patients
Electrical shock
Radiation exposure to nearby patients and staff (Correct answer)
Image quality degradation

Correct answer: Radiation exposure to nearby patients and staff

Radiation exposure to nearby persons is the primary concern, addressed by distance, shielding, and announcements.

Question 169: What is the Mortise view of the ankle and how is it positioned?

Demonstrates tibial plateau; external rotation
Demonstrates subtalar joint; lateral position
Demonstrates ankle mortise joint uniformly open; internally rotate 15-20 degrees (Correct answer)
Demonstrates calcaneus; maximum dorsiflexion

Correct answer: Demonstrates ankle mortise joint uniformly open; internally rotate 15-20 degrees

Internal rotation 15-20 degrees places the intermalleolar line parallel to the detector.

Question 170: What is the PA axial (Lordotic) chest projection used for?

Projects clavicles above lung apices to visualize apical pathology (Correct answer)
Same as PA with higher kVp
Forward bend for spine visualization
Standard PA for heart disease

Correct answer: Projects clavicles above lung apices to visualize apical pathology

The lordotic projection clears the clavicles from the apices for apical lung assessment.

Question 171: What effect does increasing kVp have on image contrast in digital radiography?

Contrast decreases from more uniform penetration (Correct answer)
Contrast increases from reduced scatter
Contrast unchanged due to post-processing
Contrast increases from more X-rays reaching detector

Correct answer: Contrast decreases from more uniform penetration

Higher kVp reduces subject contrast because higher energy photons penetrate more uniformly.

Question 172: According to the CAMRT's principle of 'Providing a Safe Environment,' what is a key responsibility of an MRT?

Intervening in circumstances of unsafe, incompetent, or unethical practice. (Correct answer)
Offering the patient the lowest possible radiation dose, even if it compromises image quality.
Making sure the patient's family is comfortable in the waiting room.
Ensuring the patient fully understands their diagnosis before the procedure.

Correct answer: Intervening in circumstances of unsafe, incompetent, or unethical practice.

The principle of 'Providing a Safe Environment' encompasses more than just technical safety. It includes the professional and ethical responsibility to take action when witnessing unsafe practices by colleagues or others, which could harm the patient. This involves making use of appropriate mechanisms to report and address such issues.

Question 173: The olecranon process is a landmark on which bone?

Radius
Ulna (Correct answer)
Humerus
Scapula

Correct answer: Ulna

The olecranon process is the bony prominence at the proximal end of the ulna, forming the point of the elbow.

Question 174: According to Health Canada's Safety Code 35, the quality control test for collimator beam alignment must ensure that the misalignment between the perimeter of the light field and the x-ray field does not exceed what value?

1 cm at any SID
2% of the Source-to-Image Distance (SID) (Correct answer)
5% of the Source-to-Image Distance (SID)
0.5% of the Source-to-Image Distance (SID)

Correct answer: 2% of the Source-to-Image Distance (SID)

Health Canada's Safety Code 35 specifies that for radiographic equipment, the misalignment between the x-ray field and the light localizer field must not exceed 2% of the SID. This tolerance ensures accurate collimation, which is critical for radiation protection and image quality.

Question 175: Which biological effects of radiation are most relevant in diagnostic imaging?

Only acute radiation syndrome
Only deterministic effects
Neither type at diagnostic levels
Stochastic effects (cancer and hereditary) are primary, as diagnostic doses are below deterministic thresholds (Correct answer)

Correct answer: Stochastic effects (cancer and hereditary) are primary, as diagnostic doses are below deterministic thresholds

Stochastic effects have no threshold, making any dose carry some probability of effect.

Question 176: Which of the following QC tests is performed WEEKLY by a technologist on a digital mammography unit to ensure consistent image quality and artifact detection?

Display monitor calibration
Half-value layer (HVL) measurement
Compression force check
Phantom image quality test (Correct answer)

Correct answer: Phantom image quality test

The weekly phantom image quality test is a critical component of a mammography QC program. The technologist images a standardized phantom (e.g., an ACR phantom) to ensure the system can consistently visualize small, low-contrast objects like fibers, specks, and masses, and to check for any new artifacts.

Question 177: During prolonged fluoroscopy, cumulative air kerma reaches 3 Gy. What is the significance?

Only operator at risk
Normal fluoroscopy dose
Exceeds threshold for deterministic skin effects; patient at risk for radiation skin injury (Correct answer)
No significance

Correct answer: Exceeds threshold for deterministic skin effects; patient at risk for radiation skin injury

3 Gy exceeds the threshold for skin injury. The patient must be monitored.

Question 178: Which document outlines entry-to-practice competencies for CAMRT certification candidates?

CAMRT Competency Profile (Correct answer)
CAMRT Code of Ethics
Canadian Health Act guidelines
Provincial practice standards

Correct answer: CAMRT Competency Profile

The Competency Profile defines required knowledge, skills, and abilities for entry-level practice.

Question 179: Which image receptor size is most commonly used for a standard PA chest radiograph on an adult patient?

24 × 30 cm
30 × 35 cm
35 × 43 cm (Correct answer)
18 × 24 cm

Correct answer: 35 × 43 cm

A 35 × 43 cm (14 × 17 inch) IR is the standard size for PA chest radiography in adults to include the full lung fields.

Question 180: In CR, what is the function of the photostimulable phosphor plate?

Amplifies the signal before digital conversion
Stores X-ray energy as a latent image released by laser stimulation (Correct answer)
Directly converts X-rays to electrical signals
Filters scatter radiation

Correct answer: Stores X-ray energy as a latent image released by laser stimulation

The PSP plate stores X-ray energy as trapped electrons, read out by laser scanning.

Question 181: In ultrasound, the term 'acoustic shadowing' describes:

Loss of signal deep to a highly reflective or absorbing structure (Correct answer)
Reverberation artifact from air
Enhancement of signal deep to a fluid-filled structure
Side-lobe artifact

Correct answer: Loss of signal deep to a highly reflective or absorbing structure

Acoustic shadowing occurs when a highly reflective or absorbing structure (e.g., gallstone, bone) blocks sound transmission, producing a dark shadow deep to it.

Question 182: What does the exposure indicator (EI) signify when significantly above target?

Detector overexposure, meaning more radiation than necessary (Correct answer)
Improved tissue differentiation
Better spatial resolution
Patient dose is excessive

Correct answer: Detector overexposure, meaning more radiation than necessary

Above-target EI indicates the detector received more radiation than needed for a diagnostic image.

Question 183: What is the correct centering for an AP supine abdomen (KUB)?

Sternal angle
Symphysis pubis
Xiphoid process
Iliac crest on the midsagittal plane (Correct answer)

Correct answer: Iliac crest on the midsagittal plane

Centre at the iliac crest to include diaphragm to symphysis pubis.

Question 184: What does CTDI (CT Dose Index) measure?

Image noise level
Total effective dose to the patient
Detector efficiency
Radiation dose profile along the z-axis for a single CT scan rotation (Correct answer)

Correct answer: Radiation dose profile along the z-axis for a single CT scan rotation

CTDI measures the absorbed dose along the z-axis (scan direction) for a single axial rotation and is a standardized CT dose descriptor.

Question 185: What is the purpose of using a 15-degree internal rotation for AP hip radiography?

To elongate the greater trochanter
To reduce patient dose
To profile the femoral neck without foreshortening (Correct answer)
To open the hip joint space

Correct answer: To profile the femoral neck without foreshortening

15 degrees of internal rotation of the foot aligns the femoral neck parallel to the IR, preventing foreshortening of the neck in the AP projection.

CAMRT Certification Exam (Radiological Technology)

The CAMRT national certification exam assesses entry-level competency for medical radiation technologists in Canada, covering clinical expertise, patient care, and professional practice across 185 multiple-choice questions.

185

Questions

240 min

Time Limit

65%

To Pass

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