Deck 12: Quality Control in Computed Tomography

Question 1

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

A)Low-contrast resolution
B)Uniformity
C)High-contrast resolution
D)Image noise

Answer 1

C

Question 2

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

A)0.5
B)1.0
C)2.0
D)5.0

Answer 2

C

Question 3

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

A)quarterly.
B)monthly.
C)weekly.
D)daily.

Answer 3

D

Question 4

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

A)daily.
B)weekly.
C)monthly.
D)semi-annually.

Question 5

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

A)20
B)40
C)30
D)80

Question 6

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

A)2
B)3
C)5
D)10

Question 7

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

A)2
B)3
C)5
D)10

Question 8

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

A)±0.5
B)±1.0
C)±2.0
D)±5.0

Question 9

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

A)0.5
B)1.0
C)2.0
D)3.0

Question 10

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

A)±2%
B)±5%
C)±10%
D)±20%