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

The beam alignment test verifies that the visible light field from the collimator matches the actual radiation field within accepted tolerances (typically ±2% of SID).

Question 2

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

Accepted Answer

Beam quality (penetrating ability)

Answer

HVL is the thickness of a specified material (usually aluminum) required to reduce beam intensity by 50%, indicating the beam's penetrating quality.

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

A sensitometer exposes imaging media to controlled light increments, and the resulting density steps are measured with a densitometer to assess processor consistency.

Question 4

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

Accepted Answer

±5% of the indicated kVp

Answer

Quality control standards (NCRP, ACR) generally accept kVp accuracy within ±5% of the set value to ensure consistent image contrast and patient dose.

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

Collimator shutters are adjustable lead blades that restrict the X-ray beam to the area being examined, reducing patient dose and scatter.

(GXMO) General X-Ray Machine Operator Practice Test

(GXMO) General X-Ray Machine Operator Practice Test

GXMO GXMO Quality Control and Maintenance