CT

Question 1

A visual inspection of a CT unit should be evaluated at least _____ for ACR accreditation programs.

Answer 1

monthly

Question 2

For ACR CT accreditation, the Water CT Number and Standard Deviation (Noise) should be evaluated by the CT technologist

Answer 2

daily

Question 3

For a slice thickness of 5 mm or less, the slice thickness should not vary by more than ____ mm.

Answer 3

0.5

Question 4

Patient dose values for CT scans should remain within ____ of the manufacturer’s specifications.

Answer 4

±10%

Question 5

Section thickness should not vary by more than ____ mm for sections greater than 5 mm.

Answer 5

±1.0

Question 6

The CT number of water should not deviate by more than ____ CT numbers from 0.

Answer 6

3

Question 7

The CTDIvol pass/fail criterion for an adult abdomen is ____ mGy.

Answer 7

30

Question 8

The laser light field and radiation field should coincide to within ____ mm.

Answer 8

2.0

Question 9

The minimum distance between two objects that allows them to be seen as separate and distinct would define what CT imaging parameter?

Answer 9

High-contrast resolution

Question 10

The uniformity of the CT number of water should not vary by more than ____ HU from the center of the phantom to the periphery.

Answer 10

5