CAMRT Certification Exam (Radiological Technology) — Questions and Answers

Question 1: What is the primary advantage of helical (spiral) CT over conventional axial CT?

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

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 2: The acanthion is a landmark used for which type of radiographic positioning?

Chest positioning
Pelvis positioning
Lumbar spine positioning
Skull and facial bone positioning (Correct answer)

Correct answer: Skull and facial bone positioning

The acanthion, located at the base of the anterior nasal spine, is a key surface landmark used in skull and facial bone radiographic positioning.

Question 3: What is the concept of justification in radiation protection?

Automatically met when a physician writes an order
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)

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

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

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

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

Question 5: What is the purpose of the CAMRT certification exam?

To provide employment opportunities.
To determine communication abilities.
To evaluate competency in medical radiation technology. (Correct answer)
To assess administrative skills.

Correct answer: To evaluate competency in medical radiation technology.

The CAMRT certification exam's primary purpose is to evaluate a candidate's competency across all domains of medical radiation technology practice. It ensures that individuals entering the profession possess the essential knowledge, skills, and judgment required to perform their duties safely and effectively. This rigorous assessment safeguards patient care and maintains high professional standards.

Question 6: 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 7: What is the ethical basis for ALARA?

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

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

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

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 9: How can internationally educated technologists apply for CAMRT membership?

They must pass a credential assessment by CAMRT. (Correct answer)
They must provide references from Canadian employers.
They must hold dual citizenship.
They must complete additional Canadian education.

Correct answer: They must pass a credential assessment by CAMRT.

Internationally educated technologists (IETs) seeking CAMRT membership and certification must undergo a thorough credential assessment. This process evaluates their foreign education and qualifications against Canadian standards to determine equivalency. It ensures that IETs meet the same rigorous professional requirements as those educated in Canada before they can be certified.

Question 10: How do gallbladder imaging positions differ between radiography and ultrasound?

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

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

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

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

Fasting ensures an empty stomach for proper barium mucosal coating.

Question 12: 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:

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

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 13: 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
Partial volume averaging
Beam hardening artifact (Correct answer)
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 14: 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
Sacroiliac joints
Pubic symphysis
Acetabulum (Correct answer)

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 15: At what cumulative fluoroscopic time does most current guidance recommend that the operator be alerted to monitor for potential high skin dose?

30 minutes
60 minutes
5 minutes (Correct answer)
1 minute

Correct answer: 5 minutes

Many regulatory and professional guidelines recommend alerting thresholds at 5 minutes of cumulative fluoroscopy time as a reference level to prompt dose monitoring and documentation in lengthy procedures.

Question 16: Which fluoroscopic technique reduces patient dose by pulsing the x-ray beam rather than continuous fluoroscopy?

Pulsed progressive fluoroscopy (Correct answer)
High-dose-rate fluoroscopy
Digital subtraction angiography
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 17: How often are CAMRT members expected to engage in professional development?

Annually, as part of their certification requirements.
Only when seeking promotions.
Continuously throughout their careers. (Correct answer)
Once every two years.

Correct answer: Continuously throughout their careers.

Medical radiation technology is a dynamic field with constant advancements, necessitating continuous learning. Therefore, CAMRT members are expected to engage in professional development continuously throughout their careers, not just periodically. This commitment to lifelong learning ensures they remain competent, adapt to new technologies, and provide the highest standard of patient care.

Question 18: For an AP erect abdomen radiograph, what is the recommended vertical centering point for the central ray to ensure the diaphragm is included?

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

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 19: What does the term 'SID' (source-to-image-receptor distance) most directly affect in radiography?

Grid ratio
Patient dose only
Image magnification and recorded detail (Correct answer)
kVp setting

Correct answer: Image magnification and recorded detail

SID directly affects image magnification (shorter SID = more magnification) and geometric sharpness (longer SID = less penumbra, better recorded detail).

Question 20: Which reconstruction algorithm in CT produces sharper edges and is preferred for bone imaging?

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

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 21: How do CAMRT members demonstrate accountability in their practice?

Adhering to professional standards and transparency. (Correct answer)
Limiting interaction with patients.
Following employer instructions without question.
Delegating responsibilities to others.

Correct answer: Adhering to professional standards and transparency.

Accountability in medical radiation technology means taking responsibility for one's professional actions and decisions. CAMRT members demonstrate this by consistently adhering to established professional standards, guidelines, and ethical principles, and by being transparent in their practice, which ensures patient safety and builds public trust.

Question 22: In MRI, the term 'T1-weighted image' refers to a sequence that highlights contrast based on:

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

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

Detector overexposure, meaning more radiation than necessary (Correct answer)
Better spatial resolution
Improved tissue differentiation
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 24: 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?

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

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 25: 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)
Better left kidney visualization
Demonstrate NG tube position
Reduce radiation dose

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

High-osmolality
Iso-osmolality for intrathecal use only
Ultra-low-osmolality for paediatric use
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 27: According to the CAMRT's principle of 'Providing a Safe Environment,' what is a key responsibility of an MRT?

Making sure the patient's family is comfortable in the waiting room.
Offering the patient the lowest possible radiation dose, even if it compromises image quality.
Intervening in circumstances of unsafe, incompetent, or unethical practice. (Correct answer)
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 28: What is the purpose of double-contrast barium enema technique?

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

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

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

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 30: 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
12
8
10 (Correct answer)

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

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

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 32: Why must both hemidiaphragms be shown on abdominal radiographs?

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

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 33: During an interventional procedure a patient develops urticaria and bronchospasm following contrast injection. What is the correct immediate management priority?

Administer an oral antihistamine and observe for 10 minutes before deciding on further action
Inject additional contrast to dilute the reaction and continue the procedure
Administer epinephrine (adrenaline) immediately, call for emergency assistance, and provide airway and circulatory support (Correct answer)
Place the patient in Trendelenburg and wait for spontaneous resolution

Correct answer: Administer epinephrine (adrenaline) immediately, call for emergency assistance, and provide airway and circulatory support

Bronchospasm combined with urticaria indicates a severe (anaphylactoid/anaphylactic) contrast reaction requiring immediate intramuscular or IV epinephrine as the first-line drug, along with emergency team activation and supportive airway management.

Question 34: What is the purpose of dose-area product (DAP) measurement?

Verify AEC accuracy
Measure skin surface dose only
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 35: What projections constitute a standard knee series?

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

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

Multiple projections demonstrate different structures without superimposition.

Question 36: What is the Towne projection of the skull?

Lateral; sella turcica
AP axial with 30-degree caudal angle through foramen magnum; occipital bone, petrous ridges, dorsum sellae (Correct answer)
AP with chin elevated; facial bones
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 37: 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?

Osmolality (Correct answer)
Iodine concentration
pH level
Viscosity

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

Acknowledge limitations, seek guidance from colleagues or references, ensure patient safety (Correct answer)
Refuse entirely
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 39: A dosimeter was left on a sunlit windowsill over the weekend. What should the technologist do?

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

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

Thallium-201 (Tl-201)
Gallium-67 (Ga-67)
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 41: 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?

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

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 42: 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?

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

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

50–100 mGy/min
1–10 mGy/min (Correct answer)
500–1000 mGy/min
0.01–0.1 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 44: What is the purpose of the erect abdomen radiograph?

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

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

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

Question 45: What is a diagnostic reference level (DRL)?

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

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

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

Correct answer: Hinge joint

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

Question 47: What membership option is available to a retiring 25-year practitioner?

One-time lifetime fee
Retired membership maintaining professional connection without practice requirements (Correct answer)
Membership automatically cancelled
Must maintain full membership

Correct answer: Retired membership maintaining professional connection without practice requirements

Retired membership maintains connection without CPD requirements.

Question 48: What does focal spot size affect, and how is it measured during QC?

Spatial resolution and sharpness; star pattern or slit camera (Correct answer)
Detector efficiency; flat-field exposure
Patient dose; ionization chamber
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 49: What role does continuing education play in maintaining ethical standards?

It focuses on technical skills alone.
It helps in obtaining promotions.
It keeps technologists updated on ethical and legal standards. (Correct answer)
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 50: What infection prevention measures apply when imaging a patient on contact precautions?

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

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

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

Question 51: How do the Standards address continuing competence?

Only at initial certification
Require members to maintain and develop knowledge, participate in lifelong learning, and demonstrate competence throughout their career (Correct answer)
Delegate to employers
Do not address it

Correct answer: Require members to maintain and develop knowledge, participate in lifelong learning, and demonstrate competence throughout their career

Ongoing competence through lifelong learning and self-assessment is explicitly required.

Question 52: Which image receptor size is most commonly used for a standard PA chest radiograph on an adult patient?

18 × 24 cm
24 × 30 cm
35 × 43 cm (Correct answer)
30 × 35 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 53: 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 54: What is the PA axial (Lordotic) chest projection used for?

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

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 55: 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 56: What are the key positioning elements for an AP pelvis radiograph?

Centre at symphysis; external rotation
Centre at iliac crest; hips flexed
Centre at umbilicus; no special positioning
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 57: 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?

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

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 58: Why is cultural competency important for Canadian MRTs?

Nice-to-have but not required
Canada diverse population requires culturally sensitive care addressing varied beliefs and communication needs (Correct answer)
Only applies when imaging Indigenous patients
Only relevant in major urban centres

Correct answer: Canada diverse population requires culturally sensitive care addressing varied beliefs and communication needs

Canada multicultural population requires cultural sensitivity in communication and care.

Question 59: 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
Idiosyncratic (Anaphylactoid) (Correct answer)
Chemotoxic
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 60: 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?

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

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

Supine
Lateral recumbent
Trendelenburg
Prone (Correct answer)

Correct answer: Prone

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

Question 62: How should the anode heel effect be utilized in clinical practice?

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

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 63: What is the primary purpose of the CAMRT Standards of Practice?

To promote international collaboration.
To evaluate professional licenses.
To outline safe and ethical practice standards. (Correct answer)
To assess members' qualifications.

Correct answer: To outline safe and ethical practice standards.

The CAMRT Standards of Practice serve as a foundational document that clearly outlines the expected safe, ethical, and competent practice standards for medical radiation technologists in Canada. These standards guide professional conduct, ensure public protection, and provide a benchmark against which the quality of MRT practice is measured. They are essential for maintaining professional integrity and patient safety.

Question 64: Which positioning landmark is palpated to locate C7 for cervical spine radiography?

Acromion
Gonion
Vertebra prominens (Correct answer)
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 65: What effect does increasing kVp have on image contrast in digital radiography?

Contrast unchanged due to post-processing
Contrast decreases from more uniform penetration (Correct answer)
Contrast increases from reduced scatter
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 66: What is the appropriate action when contrast extravasation is detected during power injection?

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

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

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

Question 67: In digital radiography, what is the primary purpose of applying a look-up table (LUT) during image processing?

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

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

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

Correct answer: Nebulized salbutamol

Nebulized salbutamol directly relaxes bronchial smooth muscle for isolated bronchospasm.

Question 69: What is the significance of the CAMRT Code of Ethics?

Identical to provincial codes
Only applies in public hospitals
Binding ethical standards with violations subject to professional conduct proceedings (Correct answer)
Voluntary guideline with no enforcement

Correct answer: Binding ethical standards with violations subject to professional conduct proceedings

The Code is enforceable through professional conduct proceedings including potential sanctions.

Question 70: What must a properly positioned PA chest demonstrate?

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

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

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

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

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

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

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

Correct answer: Maps raw pixel values to display grayscale values

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

Question 74: An anxious, claustrophobic patient arrives for imaging. What is the most appropriate initial response?

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

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

Wearing a full lead apron, thyroid collar, and leaded glasses, and maximizing distance from the beam when possible (Correct answer)
Using the highest possible kVp to reduce procedure time
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

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 76: What is the mechanism of contrast-induced nephropathy, and who is at highest risk?

Allergic tubular inflammation; shellfish allergy patients
Immune complex deposition; autoimmune patients
Direct tubular toxicity and renal vasoconstriction; patients with renal insufficiency and diabetes (Correct answer)
Mechanical obstruction; kidney stone patients

Correct answer: Direct tubular toxicity and renal vasoconstriction; patients with renal insufficiency and diabetes

CIN involves direct tubular cell toxicity and vasoconstriction. Pre-existing renal disease and diabetes are key risk factors.

Question 77: What are the Canadian C-Spine Rules and how do they differ from NEXUS?

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

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 78: 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?

Consent is not required because it is a routine, low-risk procedure.
The referring physician's order is sufficient and serves as consent.
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)

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

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

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 80: 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 81: During a double-contrast barium enema, which patient position is used to allow barium to flow from the sigmoid colon into the cecum?

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

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

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

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 83: What distinguishes ionic from non-ionic iodinated contrast media?

Non-ionic agents are always iso-osmolar
Non-ionic agents do not dissociate, resulting in lower osmolality (Correct answer)
Ionic agents are water-soluble while non-ionic are oil-based
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 84: Which of the following is a key component of obtaining valid informed consent before performing a medical imaging procedure?

Confirming the patient understands the benefits, material risks, and alternatives to the proposed procedure. (Correct answer)
Ensuring the patient has signed a generic consent form upon hospital admission.
Describing the procedure in complex medical terminology to ensure accuracy.
Having a family member provide consent on behalf of a capable adult patient.

Correct answer: Confirming the patient understands the benefits, material risks, and alternatives to the proposed procedure.

Valid informed consent requires that the patient receives a clear explanation of the procedure, its expected benefits, any significant risks, and available alternatives, allowing them to make an informed decision. A generic admission form is insufficient for specific procedures, and information must be provided in an understandable manner.

Question 85: What causes Moire artefact in digital radiography?

Patient motion
Scatter radiation
Detector malfunction
Aliasing between grid frequency and detector pixel frequency (Correct answer)

Correct answer: Aliasing between grid frequency and detector pixel frequency

Moire artefact results from aliasing when grid line frequency approaches the detector Nyquist frequency.

Question 86: What is the annual effective dose limit for a member of the general public in Canada, as specified in the Radiation Protection Regulations?

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

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 87: During a daily quality control check on a CT scanner, a water phantom is scanned. The mean CT number for a region of interest (ROI) placed in the center of the phantom should be approximately:

100 Hounsfield Units (HU)
50 Hounsfield Units (HU)
-1000 Hounsfield Units (HU)
0 Hounsfield Units (HU) (Correct answer)

Correct answer: 0 Hounsfield Units (HU)

The Hounsfield Unit (HU) scale is calibrated by definition such that water has a value of 0 HU and air has a value of -1000 HU. Daily QC tests verify the stability of this calibration, and the measured value for water should be 0 HU, with a very small tolerance (typically ± 3-4 HU).

Question 88: What causes ghosting artefact in CR?

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

Correct answer: Incomplete erasure of a previously exposed plate

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

Question 89: A vendor offers a gift in exchange for product recommendations. What is the ethical response?

Accept but disclose to manager
Accept since it does not harm patients
Accept if not too expensive
Decline and report the offer; accepting creates a conflict of interest (Correct answer)

Correct answer: Decline and report the offer; accepting creates a conflict of interest

Accepting gifts creates conflicts of interest compromising professional objectivity.

Question 90: 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?

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

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

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

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

External rotation places the greater tuberosity in lateral profile.

Question 92: What is CAMRT role in federal-level advocacy?

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

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

Blood glucose
Liver function tests
Estimated glomerular filtration rate (eGFR) (Correct answer)
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 94: What is the CFTA significance for CAMRT-certified technologists?

Allows US practice
Eliminates provincial registration
Standardizes salaries
Facilitates labour mobility by requiring provinces to recognize certification (Correct answer)

Correct answer: Facilitates labour mobility by requiring provinces to recognize certification

The CFTA facilitates interprovincial labour mobility for certified professionals.

Question 95: Annual QC testing shows the X-ray tube HVL is below acceptable minimum. What does this indicate?

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

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

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

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

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

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 98: 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
International Normalized Ratio (INR)
Estimated Glomerular Filtration Rate (eGFR) (Correct answer)
Blood Urea Nitrogen (BUN)

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

Single supine radiograph
Single erect abdomen
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 100: 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:

Chemical shift artifact
Zipper artifact (Correct answer)
Aliasing artifact
Motion 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 101: During an upper GI series, which contrast agent should be used when bowel perforation is suspected?

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

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 102: Which contrast agent is most commonly used for MRI enhancement?

Iodinated contrast (e.g., iohexol)
Ferromagnetic iron particles only
Barium sulfate
Gadolinium-based contrast agent (GBCA) (Correct answer)

Correct answer: Gadolinium-based contrast agent (GBCA)

Gadolinium-based contrast agents (GBCAs) shorten T1 relaxation time, causing enhanced tissues to appear brighter on T1-weighted MRI sequences.

Question 103: Why is a sponge placed under the waist for lateral lumbar spine imaging?

Reduces radiation dose
Patient comfort only
Centering landmark
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 104: What is the standard imaging protocol for suspected pneumothorax?

CT without plain films
Lateral in inspiration only
Supine AP 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 105: Which anatomical plane divides the body into equal right and left halves?

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

Correct answer: Midsagittal plane

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

Question 106: In CT quality control, what does the daily water phantom HU measurement test?

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

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 107: 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?

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

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 108: 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.
Proceed with the procedure using the grandchild as the translator to be efficient.
Request a qualified medical interpreter or use a hospital-approved telephone interpretation service. (Correct answer)

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

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

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

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

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

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

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 112: 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?

0.5% of the Source-to-Image Distance (SID)
1 cm at any SID
2% of the Source-to-Image Distance (SID) (Correct answer)
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 113: For an AP projection of the knee, how much is the central ray typically angled cephalad for a patient with average muscle development?

3–5 degrees cephalad (Correct answer)
10–15 degrees cephalad
0 degrees (perpendicular)
20 degrees cephalad

Correct answer: 3–5 degrees cephalad

A 3–5 degree cephalad angle is used for the AP knee to account for the normal divergence of the x-ray beam and open the joint space.

Question 114: 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?

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

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

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

Correct answer: Ratio of useful information to random fluctuations

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

Question 116: What does the term 'slice thickness' affect in CT image quality?

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

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 117: While positioning a patient for a lumbar spine X-ray, the patient confides that they are a victim of domestic abuse. According to the CAMRT Code of Ethics, what is the MRT's primary responsibility in this situation?

Ignore the comment as it is not directly related to the imaging procedure.
Immediately call the police to report the abuse.
Document the patient's statement in the clinical notes and inform the radiologist or the patient's primary healthcare provider according to facility policy. (Correct answer)
Provide the patient with advice on how to leave their situation.

Correct answer: Document the patient's statement in the clinical notes and inform the radiologist or the patient's primary healthcare provider according to facility policy.

The MRT's role is to provide safe and compassionate patient-centered care. While not a counsellor, the MRT has an ethical duty to listen and respond appropriately. The correct action is to follow institutional policy, which typically involves documenting the disclosure and reporting it to the appropriate healthcare team member (like the radiologist, nurse, or primary physician) who can connect the patient with the necessary resources and support services. This ensures the information is handled professionally and confidentially within the circle of care.

Question 118: What is the inverse square law in radiation protection?

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

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

Doubling the distance reduces exposure to 25%.

Question 119: A digital radiograph is excessively noisy. Which adjustment most effectively reduces quantum noise?

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

Correct answer: Double the mAs

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

Question 120: What is the primary mechanism by which iodinated contrast enhances CT images?

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

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

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

Question 121: In ultrasound, the term 'acoustic shadowing' describes:

Loss of signal deep to a highly reflective or absorbing structure (Correct answer)
Enhancement of signal deep to a fluid-filled structure
Reverberation artifact from air
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 122: During a power injection of iodinated contrast for a CT scan, the patient complains of sudden, sharp pain and swelling at the IV site. The MRT immediately stops the injection and suspects extravasation. What is the most appropriate initial management step?

Continue the injection at a slower rate while monitoring the site.
Remove the IV cannula and apply firm pressure to the site.
Immediately apply a warm compress to the site to disperse the contrast.
Elevate the affected limb and apply a cold compress. (Correct answer)

Correct answer: Elevate the affected limb and apply a cold compress.

The standard initial management for contrast media extravasation is to stop the injection, elevate the affected limb to reduce hydrostatic pressure, and apply cold compresses. A cold compress causes vasoconstriction, which helps to limit the spread of the extravasated contrast and reduce inflammation and pain. Warm compresses might be used later to enhance absorption but are not the recommended initial step.

Question 123: Which provincial body must an MRT register with to practise in Ontario?

CAMRT national registry
CMRITO (Correct answer)
CSMLS
Ontario Ministry of Health

Correct answer: CMRITO

CMRITO is the provincial regulatory body for Ontario.

Question 124: A patient with a history of mild contrast reaction (hives) is scheduled for contrast CT. What protocol is recommended?

Cancel the examination
Premedicate with corticosteroids and antihistamines (Correct answer)
Use gadolinium instead
Proceed without contrast

Correct answer: Premedicate with corticosteroids and antihistamines

Premedication reduces the risk of repeat reaction for patients with mild prior reactions.

Question 125: What is the primary characteristic that distinguishes fluoroscopy from conventional radiography?

It requires significantly higher mAs than static imaging
It eliminates the need for radiation protection measures
It uses a lower kVp than conventional radiography
It provides real-time, continuous X-ray imaging (Correct answer)

Correct answer: It provides real-time, continuous X-ray imaging

Fluoroscopy provides real-time, continuous X-ray imaging, allowing visualization of dynamic physiological processes such as swallowing or vessel flow.

Question 126: How do PA and oblique projections of the hand differ?

Oblique uses different central ray angle only
No differences
PA is flat on detector; oblique at 45-degree rotation separating the metacarpals (Correct answer)
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 127: What is the purpose of the CAMRT certification examination blueprint?

Define competency domains and their weighting on the exam (Correct answer)
Provide sample questions
List recommended textbooks
Outline scheduling process

Correct answer: Define competency domains and their weighting on the exam

The blueprint defines competency domains and question allocation percentages.

Question 128: 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 129: How should a technologist respond if a patient refuses a prescribed examination?

Discharge immediately
Respect their right, explore concerns, ensure they understand implications, document refusal, notify physician (Correct answer)
Insist the examination is performed
Proceed anyway

Correct answer: Respect their right, explore concerns, ensure they understand implications, document refusal, notify physician

Patient autonomy is fundamental. Explore concerns, ensure informed refusal, document, and notify.

Question 130: What is the primary safety concern with portable X-ray equipment on hospital wards?

Radiation exposure to nearby patients and staff (Correct answer)
Equipment falling on patients
Electrical shock
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 131: What is the primary pathway for a UK-trained MRT to gain Canadian credential recognition?

CAMRT PLAR process (Correct answer)
Provincial equivalency exam
Direct reciprocal agreement
Full Canadian MRT program

Correct answer: CAMRT PLAR process

CAMRT PLAR evaluates international credentials against Canadian standards.

Question 132: What are the Ottawa Ankle Rules?

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

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

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

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

Increasing kVp only
Increasing pitch
Increasing table speed
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 135: 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
Dorsal decubitus abdomen
Left lateral decubitus abdomen (Correct answer)

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

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

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 137: A patient with an NG tube arrives for a chest X-ray. What precautions are needed?

No special precautions
Clamp and disconnect the bag
Ensure tube is not displaced during positioning, verify visibility on image, maintain drainage bag position (Correct answer)
Remove the tube for image quality

Correct answer: Ensure tube is not displaced during positioning, verify visibility on image, maintain drainage bag position

The NG tube must be managed carefully during positioning and must be visible on the image.

Question 138: Which positioning method is used to demonstrate the scaphoid without foreshortening?

PA with ulnar deviation (Correct answer)
AP with radial deviation
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 139: 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
Right lateral decubitus
PA expiration (Correct answer)

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 140: An MRT in a small town recognizes a patient as their child's teacher. After the appointment, the MRT's spouse asks how the teacher is doing. To maintain patient confidentiality, the MRT should:

State that they cannot discuss any patient information due to professional privacy obligations. (Correct answer)
Confirm that the teacher was at the clinic but not disclose the reason.
Share general, non-medical information, like 'She seemed fine'.
Tell their spouse it is a small world and change the subject.

Correct answer: State that they cannot discuss any patient information due to professional privacy obligations.

The CAMRT Code of Ethics and provincial privacy legislation require MRTs to ensure the confidentiality of all patient health information and personal information. This includes not acknowledging that an individual is a patient. The only correct response is to firmly and professionally state that you cannot discuss any information related to patients.

Question 141: 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?

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

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 142: What is detective quantum efficiency (DQE)?

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

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

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

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

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

Question 144: A radiologist asks to repeat a chest X-ray the technologist believes is diagnostic. What is the appropriate response?

Report the radiologist
Repeat without question
Refuse to repeat
Respectfully discuss the concern, express professional opinion while acknowledging radiologist authority, comply with the decision (Correct answer)

Correct answer: Respectfully discuss the concern, express professional opinion while acknowledging radiologist authority, comply with the decision

Respectful communication with recognition of complementary expertise is appropriate.

Question 145: Why is confidentiality a critical aspect of medical radiation practice?

It reduces liability for technologists.
It protects patient privacy and trust. (Correct answer)
It ensures faster processing of patient data.
It promotes teamwork among staff.

Correct answer: It protects patient privacy and trust.

Confidentiality is a cornerstone of healthcare, essential for safeguarding sensitive patient information and upholding their right to privacy. By maintaining confidentiality, medical radiation technologists build and preserve patient trust, which is crucial for effective care and encourages patients to openly share necessary health details without fear.

Question 146: A fluoroscopy unit ABC is increasing kVp beyond limits. What is the likely cause?

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

Correct answer: Degraded image intensifier input phosphor

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

Question 147: What is the Mortise view of the ankle and how is it positioned?

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

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

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

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

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.
As close to the X-ray tube as possible to monitor the equipment.
Directly behind the radiologist, regardless of their position.

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

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

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.

Question 151: A patient discloses possible pregnancy before an abdominal X-ray. What should the technologist do?

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

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

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

Question 152: Oesophageal perforation is suspected during a barium swallow. Which contrast should be used?

Air contrast only
Gastrografin
Gadolinium
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 153: What role does CAMRT accreditation play in MRT education?

Evaluates programs against national competency standards (Correct answer)
Provides funding
Determines admission requirements
Sets tuition fees

Correct answer: Evaluates programs against national competency standards

Accreditation evaluates whether programs meet national standards for graduate preparation.

Question 154: Which CT windowing setting would best display pulmonary parenchyma?

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

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 155: 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.
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)
Advocating for the most appropriate care for patients.

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

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)
Only physician should disclose

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

Exceeds threshold for deterministic skin effects; patient at risk for radiation skin injury (Correct answer)
Only operator at risk
Normal fluoroscopy dose
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 158: What is the correct positioning for a lateral chest radiograph?

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

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 159: A patient with pheochromocytoma is scheduled for contrast CT. What risk must the technologist know?

Potential hypertensive crisis from catecholamine release (Correct answer)
Increased contrast allergy risk
Rapid contrast excretion
Increased extravasation risk

Correct answer: Potential hypertensive crisis from catecholamine release

Contrast can trigger catecholamine release from the tumour, causing hypertensive crisis.

Question 160: In CT imaging, what does the term 'Hounsfield unit (HU)' measure?

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

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

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

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

REDA and Safety Code 35 establish the Canadian regulatory framework.

Question 162: A technologist believes a physician ordered an inappropriate examination. What should they do?

Refuse and send the patient back
Modify the protocol without informing anyone
Exercise professional judgment, verify the order, consult the radiologist, advocate for appropriate imaging (Correct answer)
Perform without question

Correct answer: Exercise professional judgment, verify the order, consult the radiologist, advocate for appropriate imaging

Professional judgment requires verifying orders and consulting radiologists when concerns exist.

Question 163: How should a technologist communicate with a hearing-impaired patient?

Speak very loudly and slowly
Use standard instructions without modification
Communicate through family only
Face them directly, use visual aids and written instructions, confirm understanding, ask about preferred method (Correct answer)

Correct answer: Face them directly, use visual aids and written instructions, confirm understanding, ask about preferred method

Face the patient, use visual aids, provide written instructions, and respect their preferred communication method.

Question 164: What distinguishes formal from informal CPD activities in the CAMRT framework?

No distinction
Only formal activities count
Informal earn more credits
Formal are structured organized events; informal are self-directed learning like reading and peer discussion (Correct answer)

Correct answer: Formal are structured organized events; informal are self-directed learning like reading and peer discussion

Formal activities are structured; informal are self-directed. Both contribute to CPD requirements.

Question 165: What is the primary safety concern when bringing ferromagnetic objects into the MRI suite?

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

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 166: In CT, pitch is defined as:

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

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

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

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

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
AEC is only a backup with digital

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

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

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

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 171: An MRT is performing a chest x-ray on a patient who is anxious and asks, 'Do you see anything wrong on my scan? I'm so worried it's cancer.' According to the CAMRT Code of Ethics and Professional Conduct, what is the most appropriate response?

"It's against our policy to discuss results with patients. You must wait for your doctor to call you."
"I'm not qualified to interpret the images, but I've sent them to the radiologist who will prepare a report for your doctor." (Correct answer)
"Everything looks fine to me, I wouldn't worry too much if I were you."
"Let me take a quick look. I can probably give you a good idea of what's going on."

Correct answer: "I'm not qualified to interpret the images, but I've sent them to the radiologist who will prepare a report for your doctor."

The CAMRT Code of Ethics states that an MRT must answer patient questions 'fully and honestly within the limits of MRT knowledge, authority, and responsibility'. Diagnosing or interpreting images is outside the MRT's scope of practice. The correct response is to honestly state their role's limitations and explain the next step in the process, which is review by a radiologist.

Question 172: What shielding material is most common for diagnostic X-ray protection?

Lead, due to its high atomic number and density (Correct answer)
Concrete
Steel
Copper

Correct answer: Lead, due to its high atomic number and density

Lead (Z=82) provides strong photoelectric absorption of diagnostic-energy photons.

Question 173: 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 protective cover for the flat-panel detector during fluoroscopy
A lead shield placed over the image intensifier to reduce off-axis scatter

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

Proceed with MRI using a lower field strength scanner
Refuse the exam without any consultation
Perform the MRI immediately as modern pacemakers are always safe
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 175: 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?

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

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 176: During a micturating cystourethrogram (MCU/VCUG), what are the two primary diagnostic aims of the examination?

To measure bladder capacity and assess renal function
To determine post-void residual and classify bladder calculi
To assess bladder wall thickness and detect mucosal polyps
To evaluate urethral anatomy and detect vesicoureteral reflux during voiding (Correct answer)

Correct answer: To evaluate urethral anatomy and detect vesicoureteral reflux during voiding

The MCU is designed to evaluate the urethra for strictures or abnormalities during voiding and to detect vesicoureteral reflux, in which contrast flows retrograde from the bladder toward the kidney.

Question 177: A patient requests their imaging report. What are the technologist obligations under Canadian privacy law?

They must get the report from their physician
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

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 178: 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 179: 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
A row of defective detector elements (pixels) (Correct answer)
Patient motion during the exposure

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

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

Correct answer: Evaluate screen-film contact or detector uniformity

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

Question 181: The term 'PA projection' in chest radiography means the x-ray beam travels in which direction?

Superior to inferior
Lateral to medial
Anterior to posterior
Posterior to anterior (Correct answer)

Correct answer: Posterior to anterior

In a PA projection, the central ray enters the posterior (back) surface and exits the anterior (front) surface toward the image receptor.

Question 182: What examination format does the CAMRT certification exam use?

Practical skills demonstration
Oral examination
Written essay-based exam
Multiple-choice questions delivered by computer (Correct answer)

Correct answer: Multiple-choice questions delivered by computer

The exam is computer-based, multiple-choice, offered at Prometric centres.

Question 183: What is the purpose of CAMRT professional liability insurance?

Cover equipment damage
Insure the healthcare facility
Cover education costs
Provide financial protection against negligence or malpractice claims (Correct answer)

Correct answer: Provide financial protection against negligence or malpractice claims

The insurance protects members against legal claims arising from professional practice.

Question 184: How do ethical standards address social media use by MRTs?

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

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

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

Correct answer: 50 mSv

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

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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