CAMRT Imaging Equipment and QC Questions and Answers 2

Question 1

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

Accepted Answer

Insufficient beam filtration increasing patient skin dose

Answer

Tube output too high

Answer

Collimator misalignment

Answer

Focal spot too large

Question 2

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

Accepted Answer

Ensure the light field accurately represents the irradiated area

Answer

Verify tube output consistency

Answer

Check AEC chamber positions

Answer

Measure detector uniformity

Question 3

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

Accepted Answer

Degraded image intensifier input phosphor

Answer

Patient too close to receptor

Answer

Collimator too wide

Answer

Grid removed

Question 4

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

Accepted Answer

Higher intensity on cathode side; position thicker body parts toward cathode

Answer

It causes uniform exposure; no positioning needed

Answer

Higher intensity on anode side; thicker parts toward anode

Answer

Only affects mammography

Question 5

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

Accepted Answer

Calibration drift affecting diagnostic accuracy; recalibration needed

Answer

Within normal limits

Answer

Detector array needs replacement

Answer

Tube nearing end of life

Question 6

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

Accepted Answer

Evaluate screen-film contact or detector uniformity

Answer

Measure radiation output

Answer

Calculate average glandular dose

Answer

Assess compression paddle accuracy