CAMRT Certification Exam (Radiological Technology) — Questions and Answers

Question 1: In CT, pitch is defined as:

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

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

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

Question 2: 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
Insist the examination is performed
Discharge immediately

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 3: What radiation protection principles must a technologist explain to patients and families?

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

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

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

Question 4: What is the function of the 'last image hold' (LIH) feature in fluoroscopic equipment?

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

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

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

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

Xiphoid process
Symphysis pubis
Sternal angle
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 7: The Judet method, which consists of two 45-degree oblique projections of the pelvis, is specifically designed to visualize the anatomy of the:

Pubic symphysis
Sacroiliac joints
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 8: In percutaneous transluminal angioplasty (PTA), what is the mechanism by which the balloon catheter restores blood flow?

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

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

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

Question 9: What ethical considerations apply to allocation of limited imaging resources?

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

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

Allocation should follow clinical urgency and equity through established protocols.

Question 10: What does the term 'slice thickness' affect in CT image quality?

Only contrast resolution
Scan time only
Z-axis resolution and partial volume averaging (Correct answer)
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 11: 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)
Only applies to radioactive sources
Intensity doubles when distance halves
Intensity decreases linearly with distance

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

Doubling the distance reduces exposure to 25%.

Question 12: What is the purpose of the erect abdomen radiograph?

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

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

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

Question 13: What safety principle does the fluoroscopic 'dead man switch' enforce?

It automatically logs total fluoroscopy time to the PACS system
It prevents accidental patient movement by locking the table
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 14: Which geometric artifact is characteristic of image intensifier-based fluoroscopy systems?

Heel effect creating brightness gradient across the image
Motion unsharpness due to long exposure times
Quantum mottle at the image periphery
Pincushion distortion caused by the curved input phosphor projecting onto a flat output phosphor (Correct answer)

Correct answer: Pincushion distortion caused by the curved input phosphor projecting onto a flat output phosphor

Pincushion distortion arises because straight lines passing near the periphery of the curved image intensifier input screen appear to bow inward, creating a characteristic warping of peripheral structures.

Question 15: What is the appropriate action when contrast extravasation is detected during power injection?

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

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

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

Question 16: Which provincial body must an MRT register with to practise in Ontario?

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

Correct answer: CMRITO

CMRITO is the provincial regulatory body for Ontario.

Question 17: What is the purpose of collimator light-to-radiation field alignment testing?

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

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

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

Question 18: The acanthion is a landmark used for which type of radiographic positioning?

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

Correct answer: Skull and facial bone positioning

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

Question 19: 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:

-1000 Hounsfield Units (HU)
50 Hounsfield Units (HU)
0 Hounsfield Units (HU) (Correct answer)
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 20: For an AP shoulder, how should the arm be positioned to show the greater tuberosity in profile?

External rotation with hand supinated and epicondyles parallel to detector (Correct answer)
Internal rotation with hand on hip
Neutral position at side
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 21: A patient with a history of mild contrast reaction (hives) is scheduled for contrast CT. What protocol is recommended?

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

Correct answer: Premedicate with corticosteroids and antihistamines

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

Question 22: What is the concept of justification in radiation protection?

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

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

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

Question 23: 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)
Plantar flex the foot as much as possible.
Place the foot in a neutral, dorsiflexed position.

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

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

Question 24: What is the purpose of the left lateral decubitus position for abdominal radiography?

Demonstrate NG tube position
Detect small amounts of free air rising to the right flank with horizontal beam (Correct answer)
Better left kidney visualization
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 25: For a PA wrist radiograph, the central ray is directed to which carpal bone?

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

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 26: 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 27: What type of activities count as professional development for CAMRT members?

Any work-related tasks.
Workshops, conferences, and related courses. (Correct answer)
Completing routine job assignments.
Attending social networking events.

Correct answer: Workshops, conferences, and related courses.

Professional development for CAMRT members includes a range of structured learning activities designed to update and expand their professional knowledge and skills. This encompasses attending specialized workshops, participating in professional conferences, and completing relevant courses or online modules. These activities contribute to their continuing competency requirements and professional growth.

Question 28: Which combination of geometric factors will result in the highest degree of image unsharpness (penumbra)?

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

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

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

Question 29: 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)
Patient motion during the exposure
Grid cut-off due to improper alignment
A scratch on the surface of the collimator mirror

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

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

Correct answer: AP Pelvis

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

Question 31: A patient with a pacemaker presents for an MRI examination. What is the most appropriate action?

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
Refuse the exam without any consultation
Proceed with MRI using a lower field strength scanner

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 32: Why is cultural competency important for Canadian MRTs?

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

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

Canada multicultural population requires cultural sensitivity in communication and care.

Question 33: What is the function of a lookup table (LUT) in digital image processing?

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

Correct answer: Maps raw pixel values to display grayscale values

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

Question 34: At what cumulative fluoroscopic time does most current guidance recommend that the operator be alerted to monitor for potential high skin dose?

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

Correct answer: 5 minutes

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

Question 35: 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:

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

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 36: In ultrasound, the term 'acoustic shadowing' describes:

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

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

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

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

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

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

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

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

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

Question 40: What is the purpose of the wire mesh test in mammography QC?

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

Correct answer: Evaluate screen-film contact or detector uniformity

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

Question 41: According to current Canadian guidelines and the position of the CAMRT, what is the recommended practice regarding gonadal shielding for most routine diagnostic X-ray procedures?

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

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

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

Question 42: What is the role of reflective practice in MRT professional development?

Systematic process of analysing experiences to identify learning needs and earn CPD credits (Correct answer)
Formal exam requirement
Only reflecting on errors
Optional with no CPD credit

Correct answer: Systematic process of analysing experiences to identify learning needs and earn CPD credits

Reflective practice analyses experiences to gain insights and plan targeted learning.

Question 43: What educational requirement must be met for CAMRT membership?

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

Correct answer: Graduation from a CAMRT-accredited MRT program

Applicants must graduate from a CAMRT-accredited program.

Question 44: CT images show a ring artefact. What is the most likely cause?

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

Correct answer: Miscalibrated or defective detector element

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

Question 45: What is the current Canadian fasting protocol for elective contrast-enhanced CT?

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

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

Intervene appropriately, support the affected colleague, report through harassment mechanisms (Correct answer)
Join the senior colleague
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 47: 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."
"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)
"You have the right to refuse the scan if you're too nervous, but your doctor ordered it for a reason."
"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 48: In digital radiography, what is the primary purpose of applying a look-up table (LUT) during image processing?

To reduce geometric unsharpness caused by the focal spot size
To 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

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

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

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

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

Question 50: When evaluating a lateral cervical spine radiograph for technical adequacy, which of the following is the most critical criterion for ensuring the entire spine is visualized for diagnostic purposes?

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

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

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

Question 51: A 16-year-old patient arrives for a chest X-ray to rule out pneumonia. They are legally considered a minor. According to Canadian healthcare consent principles, who should provide consent for the procedure?

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

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

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

Question 52: 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 53: Which of the following technical factor adjustments will increase the penetrability of the x-ray beam, resulting in lower image contrast?

Using a smaller focal spot
Increasing the mAs
Increasing the kVp (Correct answer)
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 54: What is the purpose of the CAMRT certification examination blueprint?

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

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

The blueprint defines competency domains and question allocation percentages.

Question 55: What are the essential elements of informed consent for contrast-enhanced examinations?

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

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

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

Question 56: What is the primary safety concern when bringing ferromagnetic objects into the MRI suite?

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

Correct answer: Projectile effect from strong magnetic field attraction

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

Question 57: In a conventional image intensifier, what is the correct sequence of conversions that produces a visible fluoroscopic image?

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

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

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

Question 58: During an interventional procedure a patient develops urticaria and bronchospasm following contrast injection. What is the correct immediate management priority?

Administer an oral antihistamine and observe for 10 minutes before deciding on further action
Inject additional contrast to dilute the reaction and continue the procedure
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)

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 59: 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 60: What does CTDI (CT Dose Index) measure?

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

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

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

Question 61: The olecranon process is a landmark on which bone?

Radius
Humerus
Ulna (Correct answer)
Scapula

Correct answer: Ulna

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

Question 62: How do gallbladder imaging positions differ between radiography and ultrasound?

Standing for both
Radiography uses oblique positions to separate gallbladder from spine; ultrasound uses supine with liver as acoustic window (Correct answer)
Always supine for both
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 63: How do the Standards address continuing competence?

Only at initial certification
Delegate to employers
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 64: An MRT in a small town recognizes a patient as their child's teacher. After the appointment, the MRT's spouse asks how the teacher is doing. To maintain patient confidentiality, the MRT should:

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

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

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

Question 65: What is the purpose of dose-area product (DAP) measurement?

Verify AEC accuracy
Estimate total radiation energy delivered, accounting for dose and field size (Correct answer)
Measure skin surface dose only
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 66: What examination format does the CAMRT certification exam use?

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

Correct answer: Multiple-choice questions delivered by computer

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

Question 67: What shielding material is most common for diagnostic X-ray protection?

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

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

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

Question 68: What does the CAMRT annual conference provide for professional development?

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

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

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

Question 69: What is proper positioning for a lateral cervical spine, and what must be demonstrated?

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

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

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

Correct answer: Left lateral decubitus abdomen

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

Question 71: Which image receptor size is most commonly used for a standard PA chest radiograph on an adult patient?

35 × 43 cm (Correct answer)
18 × 24 cm
30 × 35 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 72: What is the purpose of the DLP (Dose-Length Product) metric in CT?

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

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

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

Question 73: What causes Moire artefact in digital radiography?

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

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

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

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

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

Question 75: 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?

10 (Correct answer)
12
8
7

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

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

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 77: 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 78: In digital subtraction angiography (DSA), what is a 'mask' image and how is it used?

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

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 79: 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?

Elevate the affected limb and apply a cold compress. (Correct answer)
Immediately apply a warm compress to the site to disperse the contrast.
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 80: Which contrast agent is most commonly used for MRI enhancement?

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

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

Standard PA for heart disease
Same as PA with higher kVp
Projects clavicles above lung apices to visualize apical pathology (Correct answer)
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 82: 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?

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

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 83: 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)
Lateral view of the knee (Correct answer)
Medial oblique of the knee
Tangential view of the patella (sunrise/skyline)

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 84: How does CAMRT support members who teach and mentor students?

Provides textbooks only
CPD credits for teaching, preceptor resources, educator workshops, and recognition (Correct answer)
Does not recognize teaching
Only for formal teaching appointees

Correct answer: CPD credits for teaching, preceptor resources, educator workshops, and recognition

Teaching is supported through CPD credits, resources, workshops, and professional recognition.

Question 85: During a barium swallow examination, why are multiple projections (AP, lateral, oblique) obtained rather than a single view?

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

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

Arms raised or held forward, left side against detector, true lateral alignment (Correct answer)
Arms crossed, right side against detector
One arm raised, one at side
Both arms at sides, facing 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 87: 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?

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

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

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

Question 88: What does the term 'SID' (source-to-image-receptor distance) most directly affect in radiography?

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

Correct answer: Image magnification and recorded detail

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

Question 89: What imaging protocol and findings are expected for suspected small bowel obstruction?

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

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

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

Question 90: A 17-year-old patient, who is legally able to consent for themselves, agrees to an abdominal CT scan but halfway through the procedure, they state, 'Stop, I don't want to do this anymore.' What is the MRT's ethical obligation?

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

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

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

Question 91: What is the CAMRT position on the technologist role in patient education?

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

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

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

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

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

Question 93: Which CT windowing setting would best display pulmonary parenchyma?

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

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 94: What are the Ottawa Ankle Rules?

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

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

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

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

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

Question 96: What is detective quantum efficiency (DQE)?

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

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 97: 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 98: What does signal-to-noise ratio (SNR) measurement indicate about detector performance?

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

Correct answer: Ratio of useful information to random fluctuations

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

Question 99: Which CT scan parameter, when increased, primarily reduces image noise?

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

Correct answer: Increasing mAs (tube current × time)

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

Question 100: 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?

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

Correct answer: Phantom image quality test

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

Question 101: 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
Ventral decubitus
AP axial lordotic
Lateral decubitus (Correct answer)

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

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

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

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

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

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

Question 104: What must a technologist do when performing an unfamiliar procedure?

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

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

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

Question 105: What ethical principle is emphasized by the CAMRT Code of Ethics?

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

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

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

Correct answer: The attenuation value of tissue relative to water

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

Question 107: An MRT notices a colleague frequently arriving at their shift smelling of alcohol. What is the most appropriate initial action according to professional practice standards?

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

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

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

Question 108: What is the primary eligibility criterion to sit for the CAMRT certification exam?

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

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

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

Question 109: Why must both hemidiaphragms be shown on abdominal radiographs?

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

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 110: The Waters method (modified Waters) is used to demonstrate which facial structures?

Mastoid air cells
Nasal bones
Mandible
Maxillary sinuses and orbits (Correct answer)

Correct answer: Maxillary sinuses and orbits

The Waters (parietoacanthial) projection is the standard view for demonstrating the maxillary sinuses, orbits, and zygomatic arches.

Question 111: A technologist believes a physician ordered an inappropriate examination. What should they do?

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

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

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

Question 112: What projections constitute a standard knee series?

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

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

Multiple projections demonstrate different structures without superimposition.

Question 113: What distinguishes ionic from non-ionic iodinated contrast media?

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

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

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

Question 114: In CT quality control, what does the daily water phantom HU measurement test?

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

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

Decrease source-to-image distance
Use a smaller focal spot
Increase kVp by 15%
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 116: A vendor offers a gift in exchange for product recommendations. What is the ethical response?

Accept since it does not harm patients
Decline and report the offer; accepting creates a conflict of interest (Correct answer)
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 117: A dosimeter was left on a sunlit windowsill over the weekend. What should the technologist do?

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

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

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

Correct answer: Retired membership maintaining professional connection without practice requirements

Retired membership maintains connection without CPD requirements.

Question 119: A patient presents to the emergency department with pain in the anatomical snuffbox after a fall on an outstretched hand (FOOSH). To best demonstrate a potential non-displaced scaphoid fracture, which additional projection is most critical to perform with the routine wrist series?

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

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

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

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

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

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

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

Question 122: 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)
Immediately call the police to report the abuse.
Provide the patient with advice on how to leave their situation.

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

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

Question 123: What is the recommended maximum contrast volume for a patient with eGFR of 35 mL/min?

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

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

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

Question 124: An MRT is performing a CT scan of the head. The resulting axial images show dark, streak-like artifacts and a 'cupping' artifact where the central portion of the brain parenchyma appears artificially dark. This is most characteristic of:

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

Correct answer: Beam hardening artifact

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

Question 125: What is the primary factor affecting spatial resolution in digital radiography?

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

Correct answer: Detector element (del) size

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

Question 126: 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 127: In nuclear medicine, which radionuclide is most commonly used for bone scans?

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

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

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

Correct answer: 1–10 mGy/min

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

Question 129: Which document is mandatory for applying for CAMRT membership?

Proof of graduation from an accredited program. (Correct answer)
Proof of residency status.
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 130: In percutaneous nephrostomy, which anatomical approach and calyceal target are preferred to minimize vascular injury?

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

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

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

Question 131: What are the key positioning elements for an AP pelvis radiograph?

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

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

Stores X-ray energy as a latent image released by laser stimulation (Correct answer)
Filters scatter radiation
Directly converts X-rays to electrical signals
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 133: A CT patient has an IV infusion through their only accessible vein. What should the technologist do?

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

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

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

Question 134: What must a properly positioned PA chest demonstrate?

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

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 135: 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.
Consult the radiologist to consider an alternative imaging modality not requiring contrast.
Proceed with the scan and instruct the patient to continue taking Metformin as prescribed. (Correct answer)
Instruct the patient to stop taking Metformin 48 hours before the scan.

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

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

Question 136: How should a technologist communicate with a hearing-impaired patient?

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

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

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

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

The 45-degree oblique separates overlapping metacarpals.

Question 138: A patient with pheochromocytoma is scheduled for contrast CT. What risk must the technologist know?

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

Correct answer: Potential hypertensive crisis from catecholamine release

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

Question 139: Which reconstruction algorithm in CT produces sharper edges and is preferred for bone imaging?

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

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

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

Question 140: Which biological effects of radiation are most relevant in diagnostic imaging?

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

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

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

Question 141: A radiologist asks to repeat a chest X-ray the technologist believes is diagnostic. What is the appropriate response?

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

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

Respectful communication with recognition of complementary expertise is appropriate.

Question 142: In MRI, the term 'T1-weighted image' refers to a sequence that highlights contrast based on:

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

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 143: 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?

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

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

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

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

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

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

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

Question 146: An MRT performs a portable chest x-ray using a focused grid. The resulting image demonstrates severe grid cut-off on both lateral edges, while the central portion of the image is properly exposed. What is the most likely cause of this artifact?

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

Correct answer: The grid was placed upside-down

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

Question 147: Which of the following best describes the primary objective of Health Canada's Safety Code 35?

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

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

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

Question 148: What is the primary safety concern with portable X-ray equipment on hospital wards?

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

Correct answer: Radiation exposure to nearby patients and staff

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

Question 149: What is the purpose of the 10-day and 28-day rules for female patients?

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

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

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

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

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

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

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

Question 152: During a double-contrast barium enema, which patient position is used to allow barium to flow from the sigmoid colon into the cecum?

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

Correct answer: Right lateral decubitus

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

Question 153: A fluoroscopy unit ABC is increasing kVp beyond limits. What is the likely cause?

Collimator too wide
Grid removed
Patient too close to receptor
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 154: For an AP erect abdomen radiograph, what is the recommended vertical centering point for the central ray to ensure the diaphragm is included?

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

Correct answer: Approximately 5 cm superior to the iliac crest

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

Question 155: What effect does increasing kVp have on image contrast in digital radiography?

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

Correct answer: Contrast decreases from more uniform penetration

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

Question 156: Why is confidentiality a critical aspect of medical radiation practice?

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

Correct answer: It protects patient privacy and trust.

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

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

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

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

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

Question 158: 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 159: A patient develops bronchospasm during contrast-enhanced CT. What is the first-line treatment?

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

Correct answer: Nebulized salbutamol

Nebulized salbutamol directly relaxes bronchial smooth muscle for isolated bronchospasm.

Question 160: What is the linear no-threshold (LNT) model?

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

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

To open the hip joint space
To reduce patient dose
To profile the femoral neck without foreshortening (Correct answer)
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 162: An agitated dementia patient is brought for a hip X-ray. What approach should be used?

Cancel the examination
Calm approach with simple instructions, involve caregiver, allow extra time, avoid arguing (Correct answer)
Restrain the patient
Sedate 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 163: Which lab value must be checked before giving iodinated contrast to a diabetic patient on metformin?

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

Correct answer: Estimated glomerular filtration rate (eGFR)

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

Question 164: Daily CT QC shows degraded low-contrast detectability. What should be investigated?

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

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

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

Question 165: What is the primary mechanism by which iodinated contrast enhances CT images?

Increases magnetic susceptibility
Emits radiation detected by CT detectors
Attenuates X-rays due to iodine high atomic number (Correct answer)
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 166: What are the Canadian C-Spine Rules and how do they differ from NEXUS?

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

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

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

Question 167: According to CNSC regulations, what is the annual effective dose limit for radiation workers?

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

Correct answer: 50 mSv

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

Question 168: What is the primary purpose of the CAMRT Standards of Practice?

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

Correct answer: To outline safe and ethical practice standards.

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

Question 169: Which combination of radiation protection measures is most important for the interventional radiologist who must stand near the patient during fluoroscopic-guided procedures?

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

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

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

Question 170: Which joint type is found at the knee and allows flexion and extension movements?

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

Correct answer: Hinge joint

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

Question 171: Which property of an iodinated contrast agent is the primary determinant of its potential to cause immediate, dose-dependent, non-allergic adverse effects such as a heat sensation, discomfort, and nausea?

pH level
Viscosity
Osmolality (Correct answer)
Iodine concentration

Correct answer: Osmolality

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

Question 172: What preparation is required for an upper GI series with barium?

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

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

Fasting ensures an empty stomach for proper barium mucosal coating.

Question 173: 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)
Reports are confidential and cannot be shared
They must get the report from their physician
Provide the report immediately from RIS/PACS

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

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

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

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

Question 175: 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 176: Annual QC testing shows the X-ray tube HVL is below acceptable minimum. What does this indicate?

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

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 177: What guides the CAMRT position on conscientious objection?

May object based on deeply held beliefs if patient access is not compromised and proper notification given (Correct answer)
Unlimited objection rights
Only religious objections recognized
No right to objection

Correct answer: May object based on deeply held beliefs if patient access is not compromised and proper notification given

The right to object is balanced against ensuring patient access to care.

Question 178: A patient is sent to the imaging department for a chest x-ray to rule out a small pneumothorax on the right side. In addition to the standard PA inspiration view, which of the following projections would be MOST beneficial to demonstrate this condition?

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

Correct answer: PA expiration

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

Question 179: How can an MRT contribute to the profession knowledge base through research?

Through clinical research, QI studies, case reports, and publishing findings (Correct answer)
Only PhDs can contribute
Research is outside MRT scope
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 180: What is the Towne projection of the skull?

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

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

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

Question 181: How can a CAMRT member add MRI to their radiography certification?

Attend manufacturer training only
Complete approved MRI program and pass the CAMRT MRI certification exam (Correct answer)
Begin practising immediately
Obtain new undergraduate degree

Correct answer: Complete approved MRI program and pass the CAMRT MRI certification exam

Adding a modality requires completing an accredited program and passing the corresponding exam.

Question 182: 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.
Increase the distance from the patient and primary beam to at least 2 meters during the exposure. (Correct answer)
Collimate the beam tightly to the area of interest.

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

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

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

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

Question 184: What is the standard imaging protocol for suspected pneumothorax?

CT without plain films
Erect PA chest on full expiration to increase contrast between collapsed lung and pleural air (Correct answer)
Supine AP only
Lateral in inspiration 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 185: What special radiation protection considerations apply for paediatric patients?

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

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.

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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