CAMRT Image Production and Quality Questions and Answers 2

Question 1

What is the primary factor affecting spatial resolution in digital radiography?

Accepted Answer

Detector element (del) size

Answer

Del size is the primary determinant. Smaller dels resolve finer details.

Question 2

In CR, what is the function of the photostimulable phosphor plate?

Accepted Answer

Stores X-ray energy as a latent image released by laser stimulation

Answer

The PSP plate stores X-ray energy as trapped electrons, read out by laser scanning.

Question 3

What effect does increasing kVp have on image contrast in digital radiography?

Accepted Answer

Contrast decreases from more uniform penetration

Answer

Higher kVp reduces subject contrast because higher energy photons penetrate more uniformly.

Question 4

What does the exposure indicator (EI) signify when significantly above target?

Accepted Answer

Detector overexposure, meaning more radiation than necessary

Answer

Above-target EI indicates the detector received more radiation than needed for a diagnostic image.

Question 5

What is the modulation transfer function (MTF) used for in imaging?

Accepted Answer

Quantifying how well a system preserves spatial frequency information

Answer

MTF measures how effectively contrast is transferred at various spatial frequencies.

CAMRT - Canadian Association of Medical Radiation Technologists Practice Test