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

Exposure time

Answer

Source-to-image distance

Answer

Tube current (mA)

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

Directly converts X-rays to electrical signals

Answer

Amplifies the signal before digital conversion

Answer

Filters scatter radiation

Question 3

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

Accepted Answer

Contrast decreases from more uniform penetration

Answer

Contrast increases from more X-rays reaching detector

Answer

Contrast unchanged due to post-processing

Answer

Contrast increases from reduced scatter

Question 4

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

Accepted Answer

Detector overexposure, meaning more radiation than necessary

Answer

Patient dose is excessive

Answer

Better spatial resolution

Answer

Improved tissue differentiation

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

Measuring patient dose

Answer

Calculating detector dynamic range

Answer

Assessing detector response uniformity

Question 6

What causes Moire artefact in digital radiography?

Accepted Answer

Aliasing between grid frequency and detector pixel frequency

Answer

Patient motion

Answer

Detector malfunction

Answer

Scatter radiation