CRI Equipment Calibration & Maintenance 3

Question 1

Which condition would cause a radiographic system to produce images with excessive fog density even when exposure parameters are correct?

Accepted Answer

Darkroom light leak or expired film

Answer

Darkroom light leaks or radiation-fogged expired film raise base-plus-fog density, masking true image information and indicating a maintenance issue.

Question 2

During acceptance testing of a new X-ray unit, linearity of output is checked by:

Accepted Answer

Measuring radiation output at multiple mA settings while holding kV and time constant

Answer

Output linearity testing ensures that changes in mA produce proportional changes in radiation output, confirming the generator behaves predictably.

Question 3

A collimator on an X-ray unit is primarily maintained and calibrated to ensure:

Accepted Answer

The radiation field aligns accurately with the intended exposure area

Answer

Collimator calibration ensures that the visible light field coincides with the actual radiation field, preventing unnecessary exposure and ensuring correct coverage.

Question 4

A gamma radiography projector (camera) is found to have a cracked or damaged guide tube connector. The correct action is:

Accepted Answer

Remove from service immediately and quarantine for repair

Answer

Damaged guide tube connectors on gamma projectors create a radiological safety hazard and the unit must be removed from service until properly repaired.

Question 5

The half-value layer (HVL) measurement of an X-ray unit is used to assess:

Accepted Answer

The beam quality (effective energy) and filtration adequacy

Answer

HVL measurement characterizes the beam's penetrating quality; a change from baseline indicates filtration problems or voltage calibration drift.

(CRI) Certified Radiographic Interpreter Practice Test

(CRI) Certified Radiographic Interpreter Practice Test

CRI Equipment Calibration & Maintenance 3