Radiography Exam Image Production & Processing

Question 1

In digital radiography, what does the exposure index (EI) primarily indicate?

Accepted Answer

The amount of radiation that reached the detector

Answer

The amount of radiation the patient received

Answer

The contrast resolution of the image

Answer

The spatial resolution of the detector

Question 2

Which artifact in computed radiography (CR) appears as a ghost image from a previous exposure due to incomplete erasure?

Accepted Answer

Lag artifact (ghosting)

Answer

Grid artifact

Answer

Quantum mottle

Answer

Moiré pattern

Question 3

What is the primary advantage of direct digital radiography (DR) over computed radiography (CR)?

Accepted Answer

Immediate image availability without plate handling

Answer

Lower cost of equipment

Answer

Better spatial resolution

Answer

Smaller file sizes

Question 4

In digital imaging, which term describes the range of exposure values over which the detector can produce a diagnostic image?

Accepted Answer

Dynamic range

Answer

Spatial resolution

Answer

Quantum efficiency

Answer

Modulation transfer function

Question 5

What happens to image noise (quantum mottle) when mAs is decreased in digital radiography?

Accepted Answer

Noise increases because fewer photons form the image

Answer

Noise decreases

Answer

Noise is unaffected because digital processing corrects it

Answer

Noise only changes with kVp

Question 6

Which factor primarily determines the spatial resolution of a digital detector system?

Accepted Answer

Pixel size (detector element size)

Answer

kVp setting

Answer

mAs setting

Answer

SID