CAMRT Imaging Equipment and QC Questions and Answers 3

Question 1

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

Accepted Answer

Radiation exposure to nearby patients and staff

Answer

Electrical shock

Answer

Equipment falling on patients

Answer

Image quality degradation

Question 2

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

Accepted Answer

Spatial resolution and sharpness; star pattern or slit camera

Answer

Patient dose; ionization chamber

Answer

Image contrast; contrast-detail phantom

Answer

Detector efficiency; flat-field exposure

Question 3

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

Accepted Answer

Room temperature, detector calibration, tube output, and noise levels

Answer

Table calibration

Answer

Gantry speed only

Answer

Monitor brightness

Question 4

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

Accepted Answer

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

Answer

Measure skin surface dose only

Answer

Calculate effective dose for reporting

Answer

Verify AEC accuracy

Question 5

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

Accepted Answer

Miscalibrated or defective detector element

Answer

Patient motion

Answer

Wrong reconstruction algorithm

Answer

Metal implant

Question 6

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

Accepted Answer

Health Canada Radiation Emitting Devices Act and Safety Code 35

Answer

CSA Z462

Answer

CAN/CSA-C22.2

Answer

ISO 9001