CAMRT Certification Exam (Radiological Technology) — Questions and Answers

Question 1: What is a primary goal of professional development for CAMRT members?

To qualify for a certification renewal.
To complete administrative tasks efficiently.
To meet employer requirements.
To maintain and enhance professional skills. (Correct answer)

Correct answer: To maintain and enhance professional skills.

A primary goal of professional development for CAMRT members is to continuously maintain and enhance their professional skills and knowledge. This is vital in the rapidly evolving field of medical radiation technology, allowing practitioners to adapt to new technologies, techniques, and best practices. Ultimately, this commitment improves the quality of patient care.

Question 2: Which of the following radiographic positions is specifically designed to demonstrate a small, free-flowing pleural effusion in a patient who is unable to stand?

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

Correct answer: Lateral decubitus

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

Question 3: During a double-contrast barium enema, which patient position is used to allow barium to flow from the sigmoid colon into the cecum?

Left lateral decubitus
Right lateral decubitus (Correct answer)
Prone position
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 4: Which CT scan parameter, when increased, primarily reduces image noise?

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

Correct answer: Increasing mAs (tube current × time)

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

Question 5: What is the CAMRT position on the technologist role in patient education?

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

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

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

Question 6: A vendor offers a gift in exchange for product recommendations. What is the ethical response?

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

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

Accepting gifts creates conflicts of interest compromising professional objectivity.

Question 7: What is CAMRT role in federal-level advocacy?

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

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

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

Question 8: In a lateral hip radiograph using the Lauenstein method, the affected leg is placed in which position?

Extended and internally rotated
Flexed and abducted (frog-leg) (Correct answer)
Crossed over the unaffected leg
Extended and externally rotated

Correct answer: Flexed and abducted (frog-leg)

The Lauenstein (frog-leg lateral) method places the hip in flexion and abduction with the knee bent to demonstrate the femoral neck in a lateral projection.

Question 9: What does the term 'SID' (source-to-image-receptor distance) most directly affect in radiography?

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

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

Correct answer: AP Pelvis

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

Question 11: What is proper positioning for a lateral cervical spine, and what must be demonstrated?

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

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

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

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

The 45-degree oblique separates overlapping metacarpals.

Question 13: In CR, what is the function of the photostimulable phosphor plate?

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

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 14: Which membership categories are available to non-certified individuals?

Honorary and retired only
No categories for non-certified individuals
Student and associate membership (Correct answer)
Full membership only

Correct answer: Student and associate membership

Student membership for those in accredited programs and associate membership for professionals involved in the field.

Question 15: What role does continuing education play in maintaining ethical standards?

It keeps technologists updated on ethical and legal standards. (Correct answer)
It focuses on technical skills alone.
It helps in obtaining promotions.
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 16: How do the Standards address continuing competence?

Delegate to employers
Only at initial certification
Require members to maintain and develop knowledge, participate in lifelong learning, and demonstrate competence throughout their career (Correct answer)
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 17: What is the purpose of using a 15-degree internal rotation for AP hip radiography?

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

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 18: A technologist witnesses a senior colleague verbally bullying a junior staff member. What obligations apply?

Join the senior colleague
Intervene appropriately, support the affected colleague, report through harassment mechanisms (Correct answer)
Advise the junior colleague to toughen up
Stay out of it

Correct answer: Intervene appropriately, support the affected colleague, report through harassment mechanisms

Workplace bullying violates ethics and safety standards. Bystanders must intervene, support, and report.

Question 19: What does signal-to-noise ratio (SNR) measurement indicate about detector performance?

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

Correct answer: Ratio of useful information to random fluctuations

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

Question 20: 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?

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

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 21: What ethical considerations apply when participating in research imaging?

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

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

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

Question 22: What are the Ottawa Ankle Rules?

Clinical decision rules determining whether ankle radiographs are needed based on physical findings (Correct answer)
Image quality evaluation criteria
Radiation dose limits for ankles
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 23: What is the role of the Radiation Safety Officer in a medical imaging facility?

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

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

Following employer instructions without question.
Adhering to professional standards and transparency. (Correct answer)
Limiting interaction with patients.
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 25: What is a diagnostic reference level (DRL)?

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

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 26: Which of the following is a key component of obtaining valid informed consent before performing a medical imaging procedure?

Describing the procedure in complex medical terminology to ensure accuracy.
Ensuring the patient has signed a generic consent form upon hospital admission.
Confirming the patient understands the benefits, material risks, and alternatives to the proposed procedure. (Correct answer)
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 27: What is the function of a lookup table (LUT) in digital image processing?

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

Correct answer: Maps raw pixel values to display grayscale values

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

Question 28: Annual QC testing shows the X-ray tube HVL is below acceptable minimum. What does this indicate?

Focal spot too large
Collimator misalignment
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 29: What is the Mortise view of the ankle and how is it positioned?

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

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

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

Question 30: What are the Canadian C-Spine Rules and how do they differ from NEXUS?

Quality standards for image evaluation
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

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

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

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

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

Question 32: 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 33: An elderly patient scheduled for a CT scan of the abdomen expresses significant anxiety about the procedure, stating, "I'm worried about the radiation and what you might find." What is the MOST appropriate initial response for a Medical Radiation Technologist (MRT)?

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

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

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

Question 34: 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?

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

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 35: 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 spinous processes are seen in profile with no rotation.
The prevertebral soft tissue shadow is within normal limits.
The C7-T1 vertebral space is clearly demonstrated. (Correct answer)

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

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

Question 36: In nuclear medicine, which radionuclide is most commonly used for bone scans?

Technetium-99m (Tc-99m) (Correct answer)
Gallium-67 (Ga-67)
Thallium-201 (Tl-201)
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 37: Which CT windowing setting would best display pulmonary parenchyma?

Window width 400, level 40 (soft tissue)
Window width 80, level 35 (brain window)
Window width 1500, level −600 (lung window) (Correct answer)
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 38: Which biological effects of radiation are most relevant in diagnostic imaging?

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

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

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

Question 39: How should the anode heel effect be utilized in clinical practice?

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

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

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

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

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

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

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

Question 42: What is the correct positioning for the AP open-mouth (odontoid) projection?

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

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

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

Question 43: During prolonged fluoroscopy, cumulative air kerma reaches 3 Gy. What is the significance?

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

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 44: 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?

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

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

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

Question 45: What does the term 'slice thickness' affect in CT image quality?

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

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 46: 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 47: A patient requests their imaging report. What are the technologist obligations under Canadian privacy law?

Inform the patient of their right to access and direct them to the proper process (Correct answer)
They must get the report from their physician
Provide the report immediately from RIS/PACS
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 48: When positioning for a lateral lumbar spine radiograph, which structure is used as the centering point?

T12 vertebra
L3 vertebra (Correct answer)
ASIS
Iliac crest

Correct answer: L3 vertebra

The central ray is directed to L3, located at approximately the level of the iliac crest, as the centering point for lateral lumbar spine projections.

Question 49: What educational requirement must be met for CAMRT membership?

Graduation from a CAMRT-accredited MRT program (Correct answer)
Any health science bachelor degree
Master degree in medical physics
Hospital-based apprenticeship

Correct answer: Graduation from a CAMRT-accredited MRT program

Applicants must graduate from a CAMRT-accredited program.

Question 50: An agitated dementia patient is brought for a hip X-ray. What approach should be used?

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

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

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

Question 51: What is the Towne projection of the skull?

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

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

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

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

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

Question 53: Which document is mandatory for applying for CAMRT membership?

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

Correct answer: Proof of graduation from an accredited program.

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

Question 54: What special radiation protection considerations apply for paediatric patients?

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

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

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

Question 55: The olecranon process is a landmark on which bone?

Humerus
Scapula
Radius
Ulna (Correct answer)

Correct answer: Ulna

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

Question 56: During a micturating cystourethrogram (MCU/VCUG), what are the two primary diagnostic aims of the examination?

To assess bladder wall thickness and detect mucosal polyps
To determine post-void residual and classify bladder calculi
To measure bladder capacity and assess renal function
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 57: Daily CT QC shows degraded low-contrast detectability. What should be investigated?

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

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

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

Question 58: A patient develops bronchospasm during contrast-enhanced CT. What is the first-line treatment?

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

Correct answer: Nebulized salbutamol

Nebulized salbutamol directly relaxes bronchial smooth muscle for isolated bronchospasm.

Question 59: What is the PA axial (Lordotic) chest projection used for?

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

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

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

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

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

Question 61: Which of the following palpable anatomical landmarks is the most commonly used and reliable for centering a routine supine AP abdomen radiograph?

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

Correct answer: Iliac crest

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

Question 62: 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 63: How should a technologist respond if a patient refuses a prescribed examination?

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

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 64: 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 65: In percutaneous transluminal angioplasty (PTA), what is the mechanism by which the balloon catheter restores blood flow?

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

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

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

Question 66: What does the CAMRT Code of Ethics say about professional boundaries with patients?

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

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

Boundaries prevent exploitation of the healthcare power imbalance.

Question 67: In CT, pitch is defined as:

The thickness of a single CT slice
The number of detector rows
The tube current in milliamperes
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 68: 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
Beam-hardening/metal artifact (Correct answer)
Ring artifact
Partial volume artifact

Correct answer: Beam-hardening/metal artifact

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

Question 69: 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:

Chemotoxic
Idiosyncratic (Anaphylactoid) (Correct answer)
Pyrogenic
Vasovagal

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 70: What resource does CAMRT provide to support professional development?

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

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

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

Question 71: What is the function of the 'last image hold' (LIH) feature in fluoroscopic equipment?

It reduces the image refresh rate to lower dose during dynamic runs
It displays the most recently acquired fluoroscopic frame as a static image without ongoing radiation (Correct answer)
It automatically records a cine loop of the entire procedure
It permanently archives all fluoroscopic frames to PACS

Correct answer: It displays the most recently acquired fluoroscopic frame as a static image without ongoing radiation

LIH captures and displays the last acquired fluoroscopic frame as a static image, allowing the operator to review the image without continuing to expose the patient to radiation.

Question 72: What is the linear no-threshold (LNT) model?

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

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

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

Question 73: 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?

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.
Proceed with the scan and instruct the patient to continue taking Metformin as prescribed. (Correct answer)
Consult the radiologist to consider an alternative imaging modality not requiring contrast.

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

Place the patient in Trendelenburg and wait for spontaneous resolution
Administer epinephrine (adrenaline) immediately, call for emergency assistance, and provide airway and circulatory support (Correct answer)
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

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 75: What is the purpose of the erect abdomen radiograph?

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

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

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

Question 76: 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?

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

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 77: What ethical considerations apply to allocation of limited imaging resources?

Prioritize most profitable exams
First-come-first-served only
Clinical urgency, equity, transparency, and non-discrimination with established triage protocols (Correct answer)
Individual technologist judgment

Correct answer: Clinical urgency, equity, transparency, and non-discrimination with established triage protocols

Allocation should follow clinical urgency and equity through established protocols.

Question 78: A patient with a pacemaker presents for an MRI examination. What is the most appropriate action?

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

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

Lateral to medial
Anterior to posterior
Superior to inferior
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 80: Which document outlines entry-to-practice competencies for CAMRT certification candidates?

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

Correct answer: CAMRT Competency Profile

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

Question 81: What is the primary advantage of helical (spiral) CT over conventional axial CT?

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

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

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

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

Fasting ensures an empty stomach for proper barium mucosal coating.

Question 83: What imaging protocol and findings are expected for suspected small bowel obstruction?

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

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

Midway between the xiphoid process and iliac crest
At the level of the iliac crest
At the level of the xiphoid process
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 85: What radiation protection principles must a technologist explain to patients and families?

Only ALARA
That patients should avoid all future imaging
Time, distance, shielding, justification, and dose optimization (Correct answer)
That all medical radiation is completely safe

Correct answer: Time, distance, shielding, justification, and dose optimization

Explain the three pillars of protection along with justification and optimization concepts.

Question 86: A technologist believes an ordered examination may be unnecessary. What are the ethical responsibilities?

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

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

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

Question 87: 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?

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

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

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

Correct answer: CT number accuracy and scanner calibration

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

Question 89: What is the primary purpose of the automatic brightness control (ABC) system in a fluoroscopic unit?

To set the black-and-white contrast ratio on the display monitor
To adjust room ambient lighting for optimal monitor viewing conditions
To automatically adjust kVp and/or mA to maintain consistent image brightness as attenuation changes (Correct answer)
To control the speed at which the image intensifier rotates during the study

Correct answer: To automatically adjust kVp and/or mA to maintain consistent image brightness as attenuation changes

ABC automatically adjusts exposure parameters (kVp and/or mA) to compensate for changes in tissue thickness or density, maintaining consistent image brightness throughout the examination.

Question 90: What does the exposure indicator (EI) signify when significantly above target?

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

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 91: What causes Moire artefact in digital radiography?

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

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 92: For an AP projection of the knee, how much is the central ray typically angled cephalad for a patient with average muscle development?

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

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

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

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

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

Question 94: What are the key positioning elements for an AP pelvis radiograph?

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

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 95: 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 96: 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 97: An MRI technologist observes a series of sharp, linear artifacts across an image, perpendicular to the frequency encoding direction. The artifact disappears after the technologist ensures the scanner room door is fully sealed. This phenomenon is known as a:

Zipper artifact (Correct answer)
Chemical shift artifact
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 98: What credential designation does a CAMRT-certified radiological technologist hold?

CAMRT(R)
RTR(C)
MRT(R) (Correct answer)
RT(R)

Correct answer: MRT(R)

MRT(R) stands for Medical Radiation Technologist (Radiological Technology).

Question 99: An MRT performs a portable chest x-ray using a focused grid. The resulting image demonstrates severe grid cut-off on both lateral edges, while the central portion of the image is properly exposed. What is the most likely cause of this artifact?

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

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

Trendelenburg
Prone (Correct answer)
Lateral recumbent
Supine

Correct answer: Prone

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

Question 101: 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.
Directly behind the radiologist, regardless of their position.
As close to the X-ray tube as possible to monitor the equipment.

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

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

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

REDA and Safety Code 35 establish the Canadian regulatory framework.

Question 103: What is the primary factor affecting spatial resolution in digital radiography?

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

Correct answer: Detector element (del) size

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

Question 104: What is the role of technology literacy in ongoing MRT professional development?

Only important for IT staff
Covered entirely in initial education
Only manufacturer training needed
Essential for adapting to new modalities, AI applications, dose tools, and digital workflows (Correct answer)

Correct answer: Essential for adapting to new modalities, AI applications, dose tools, and digital workflows

Technology literacy is critical as imaging technology evolves rapidly.

Question 105: What is the standard imaging protocol for suspected pneumothorax?

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

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

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

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

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

Question 107: How can internationally educated technologists obtain certification with CAMRT?

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

Correct answer: Undergo credential assessment and meet equivalency requirements.

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

Question 108: A digital radiograph is excessively noisy. Which adjustment most effectively reduces quantum noise?

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

Correct answer: Double the mAs

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

Question 109: During a barium swallow examination, why are multiple projections (AP, lateral, oblique) obtained rather than a single view?

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

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

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

Question 110: A patient with pheochromocytoma is scheduled for contrast CT. What risk must the technologist know?

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

Correct answer: Potential hypertensive crisis from catecholamine release

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

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

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

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

Excessive Object-to-Image Distance (OID)
Use of a high-ratio grid
Insufficient mAs (Correct answer)
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 113: Which of the following best describes the primary objective of Health Canada's Safety Code 35?

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

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 114: 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?

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

Correct answer: Left lateral decubitus abdomen

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

Question 115: What is the concept of justification in radiation protection?

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

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

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

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

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

Question 117: Which lab value must be checked before giving iodinated contrast to a diabetic patient on metformin?

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

Correct answer: Estimated glomerular filtration rate (eGFR)

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

Question 118: CT QC shows water measures consistently +8 HU instead of 0. What is the significance?

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

Correct answer: Calibration drift affecting diagnostic accuracy; recalibration needed

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

Question 119: What is the correct positioning for a lateral chest radiograph?

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

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

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

Correct answer: Contrast decreases from more uniform penetration

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

Question 121: What is the appropriate action when contrast extravasation is detected during power injection?

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

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

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

Question 122: What is the typical entrance skin dose rate range during standard fluoroscopy?

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

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

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

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

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

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 125: 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?

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

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 126: A colleague confides they have been working while impaired by prescription medication. What are the obligations?

Report through appropriate channels as patient safety takes priority (Correct answer)
Cover for the colleague
Advise sick leave and keep it private
Maintain confidentiality, take no action

Correct answer: Report through appropriate channels as patient safety takes priority

Patient safety is paramount. An impaired practitioner poses direct risk.

Question 127: A fluoroscopy unit ABC is increasing kVp beyond limits. What is the likely cause?

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

Correct answer: Degraded image intensifier input phosphor

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

Question 128: CT images show a ring artefact. What is the most likely cause?

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

Correct answer: Miscalibrated or defective detector element

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

Question 129: What infection prevention measures apply when imaging a patient on contact precautions?

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

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

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

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

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

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

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

Question 131: What benefit does CAMRT membership provide to practicing technologists?

Guaranteed promotions in their workplace.
Continuing education and professional support. (Correct answer)
Direct employment placement services.
Free access to medical equipment.

Correct answer: Continuing education and professional support.

CAMRT membership provides practicing technologists with access to crucial resources for continuing education and professional support. This includes workshops, conferences, online learning modules, and networking opportunities. These benefits help members stay current with advancements in their field, enhance their skills, and maintain their professional competency.

Question 132: How does AEC function differently with digital detectors versus film-screen?

AEC is not needed with digital detectors
AEC still controls exposure termination but targets optimal detector exposure (EI) rather than optical density (Correct answer)
AEC operates identically
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 133: The Judet method, which consists of two 45-degree oblique projections of the pelvis, is specifically designed to visualize the anatomy of the:

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

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

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

Correct answer: Evaluate screen-film contact or detector uniformity

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

Question 135: What is the purpose of dose-area product (DAP) measurement?

Estimate total radiation energy delivered, accounting for dose and field size (Correct answer)
Measure skin surface dose only
Verify AEC accuracy
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 136: What is detective quantum efficiency (DQE)?

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

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

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

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

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

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 139: A wrong examination was attributed to a patient in the imaging record. What are the obligations?

Wait until someone notices
Ignore it
Correct immediately through proper channels, report the incident, document the correction (Correct answer)
Modify the record quietly

Correct answer: Correct immediately through proper channels, report the incident, document the correction

Record errors must be corrected properly, reported, and documented for patient safety.

Question 140: What is the mechanism of contrast-induced nephropathy, and who is at highest risk?

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

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

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

Correct answer: Annually

Membership must be renewed annually.

Question 142: For a PA wrist radiograph, the central ray is directed to which carpal bone?

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

Correct answer: Midcarpal area (capitate)

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

Question 143: How can an MRT contribute to the profession knowledge base through research?

Only PhDs can contribute
Research is outside MRT scope
Through clinical research, QI studies, case reports, and publishing findings (Correct answer)
Only by assisting physicians

Correct answer: Through clinical research, QI studies, case reports, and publishing findings

MRTs contribute through clinical studies, QI projects, case reports, and publication.

Question 144: What is the inverse square law in radiation protection?

Intensity decreases with the square of distance; doubling distance reduces exposure to one-quarter (Correct answer)
Intensity doubles when distance halves
Intensity decreases linearly with distance
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 145: When performing an AP projection of the hip on an ambulatory adult patient, what is the correct positioning of the patient's foot and lower leg to place the femoral neck parallel to the image receptor?

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

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

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

Question 146: Which reconstruction algorithm in CT produces sharper edges and is preferred for bone imaging?

Soft tissue (smooth) kernel
Standard (medium) kernel
Lung 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 147: In digital subtraction angiography (DSA), what is a 'mask' image and how is it used?

A post-processing filter that enhances vessel edge sharpness
A pre-contrast baseline image electronically subtracted from contrast-filled frames, leaving only opacified vessels visible (Correct answer)
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 148: How do CAMRT ethical standards address truthfulness and error disclosure?

Ethical obligation to be truthful, disclose errors through institutional processes, and participate in QI (Correct answer)
Only disclose if patient asks
Errors should be concealed
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 149: 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.
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.
Immediately call the police to report the abuse.

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

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

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

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

Question 151: What is the modulation transfer function (MTF) used for in imaging?

Calculating detector dynamic range
Assessing detector response uniformity
Quantifying how well a system preserves spatial frequency information (Correct answer)
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 152: In a hysterosalpingogram (HSG), contrast medium is instilled through which route?

Into the peritoneal cavity via transabdominal puncture
Intravenously to opacify the uterine vasculature
Directly into the fallopian tubes via laparoscopic cannula
Through the cervix into the uterine cavity, with flow into the tubes demonstrating patency (Correct answer)

Correct answer: Through the cervix into the uterine cavity, with flow into the tubes demonstrating patency

HSG involves transcervical catheter placement to fill the uterine cavity with contrast; free spill from the fimbriated ends of the fallopian tubes into the peritoneum confirms tubal patency.

Question 153: What projections constitute a standard knee series?

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

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

Multiple projections demonstrate different structures without superimposition.

Question 154: What distinguishes ionic from non-ionic iodinated contrast media?

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

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

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

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

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

Question 156: What does the CAMRT annual conference provide for professional development?

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

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

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

Question 157: 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 158: A dosimeter was left on a sunlit windowsill over the weekend. What should the technologist do?

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

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 159: What does CTDI (CT Dose Index) measure?

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

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

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

Question 160: According to CNSC regulations, what is the annual effective dose limit for radiation workers?

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

Correct answer: 50 mSv

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

Question 161: What is the purpose of the DLP (Dose-Length Product) metric in CT?

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

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 162: 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?

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

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 163: 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 164: Which positioning landmark is palpated to locate C7 for cervical spine radiography?

Gonion
Vertebra prominens (Correct answer)
Acromion
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 165: What is the purpose of collimator light-to-radiation field alignment testing?

Ensure the light field accurately represents the irradiated area (Correct answer)
Check AEC chamber positions
Verify tube output consistency
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 166: A patient is scheduled for an MRI and becomes extremely agitated and claustrophobic upon seeing the scanner. Which communication strategy is MOST effective for the MRT to use first?

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

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

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

Question 167: Which contrast agent is most commonly used for MRI enhancement?

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

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

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

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 169: 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?

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

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 170: 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:

Backup timer function
Spatial resolution
Minimum response time
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 171: 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 172: What is the current Canadian fasting protocol for elective contrast-enhanced CT?

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

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 173: 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 174: 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
1 mSv (Correct answer)
5 mSv

Correct answer: 1 mSv

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

Question 175: Which image receptor size is most commonly used for a standard PA chest radiograph on an adult patient?

30 × 35 cm
35 × 43 cm (Correct answer)
18 × 24 cm
24 × 30 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 176: 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 177: In ultrasound, the term 'acoustic shadowing' describes:

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

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

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

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 179: 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:

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

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

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

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

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

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

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

Question 182: What ethical principle is emphasized by the CAMRT Code of Ethics?

Advancing organizational goals.
Patient-centered care and respect. (Correct answer)
Promoting technical skills exclusively.
Efficiency in workplace management.

Correct answer: Patient-centered care and respect.

The CAMRT Code of Ethics, like most healthcare professional codes, fundamentally prioritizes the well-being and dignity of patients. This principle ensures that all actions and decisions made by medical radiation technologists are guided by the patient's best interests, autonomy, and respect, fostering trust and ethical care.

Question 183: 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)
Using grid pulsing to suppress scatter radiation
Alternating between high and low kVp to enhance contrast
Rapidly acquiring sequential spot images for cine analysis

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

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

Correct answer: Premedicate with corticosteroids and antihistamines

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

Question 185: 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
5% of the Source-to-Image Distance (SID)
2% of the Source-to-Image Distance (SID) (Correct answer)

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.

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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