GXMO GXMO Quality Control and Maintenance 2

Question 1

Automatic exposure control (AEC) devices should be tested regularly. A common QC test for AEC verifies:

Accepted Answer

Consistency of mAs output across different kVp settings

Answer

AEC QC tests confirm that the system delivers consistent mAs (and therefore consistent receptor exposure) across a range of kVp values and patient thicknesses.

Question 2

Artifacts caused by dirt or debris on a CR (computed radiography) imaging plate most commonly appear as:

Accepted Answer

White (unexposed) or black dots and lines on the image

Answer

Foreign material on a CR plate blocks or scatters the laser during readout, creating white (or occasionally dark) artifacts on the processed image.

Question 3

The base-plus-fog (B+F) level of radiographic film processed without exposure should be:

Accepted Answer

0.18 or less

Answer

A B+F density of 0.18 or less indicates that the film base and chemical fog are within acceptable limits, ensuring adequate image contrast.

Question 4

Which component of a digital radiography system converts X-ray photons directly into an electrical signal without an intermediate step?

Accepted Answer

Direct DR flat panel detector (amorphous selenium)

Answer

Direct DR detectors use amorphous selenium to convert X-rays directly to electrical charge, while indirect detectors use a scintillator to first convert X-rays to light.

Question 5

Repeat analysis in a quality control program is performed to:

Accepted Answer

Identify common causes of repeat exposures and reduce patient dose

Answer

Repeat analysis tracks the frequency and reasons for repeated exposures, allowing targeted corrective action to reduce unnecessary patient radiation dose.

(GXMO) General X-Ray Machine Operator Practice Test

(GXMO) General X-Ray Machine Operator Practice Test

GXMO GXMO Quality Control and Maintenance 2