GXMO GXMO Quality Control and Maintenance

Question 1

Which quality control test is used to verify that the light field of the collimator accurately corresponds to the X-ray field?

Accepted Answer

Beam alignment (light/radiation field congruence) test

Answer

Half-value layer (HVL) test

Answer

Sensitometric strip test

Answer

Focal spot size test

Question 2

The half-value layer (HVL) of an X-ray beam is a measure of:

Accepted Answer

Beam quality (penetrating ability)

Answer

Beam quantity (number of photons)

Answer

Focal spot size

Answer

Detector sensitivity

Question 3

A sensitometer is used in radiographic quality control to:

Accepted Answer

Expose film/CR plates to a standardized series of light steps for processing evaluation

Answer

Measure radiation output from the X-ray tube

Answer

Check collimator accuracy

Answer

Evaluate focal spot size

Question 4

Acceptable tolerance for kVp accuracy in a quality control program is generally:

Accepted Answer

±5% of the indicated kVp

Answer

±10% of the indicated kVp

Answer

±1% of the indicated kVp

Answer

±15% of the indicated kVp

Question 5

The purpose of collimator shutters in an X-ray unit is to:

Accepted Answer

Restrict the primary beam to the area of clinical interest

Answer

Filter low-energy photons from the beam

Answer

Support the image receptor

Answer

Cool the X-ray tube anode

Question 6

Which QC test evaluates whether the X-ray tube's focal spot has enlarged beyond acceptable limits?

Accepted Answer

Star resolution pattern or pinhole camera test

Answer

Step wedge exposure test

Answer

Sensitometric strip test

Answer

Beam alignment test