Deck 8: Quality Control of Fluoroscopic Equipment

Question 1

Which type of distortion that can occur with tube-type fluoroscopic image intensifiers is most often caused by the presence of strong magnetic fields?

A)Veiling glare
B)S distortion
C)Pincushion distortion
D)Vignetting

Answer 1

B

Question 2

At any combination of tube potential and current, fluoroscopic equipment with an automatic brightness control should not produce an entrance skin exposure exceeding ____ R/min.

A)2.5
B)5
C)10
D)20

Answer 2

C

Question 3

The input phosphor of an image intensifier tube converts a(n) _____ image into a(n) _____ image.

A)x-ray; light
B)light; electron
C)electron; light
D)x-ray; electron

Answer 3

A

Question 4

A photocathode is a device that emits

A)light photons.
B)x-ray photons.
C)electrons.
D)all of the above.

Question 5

Quality control tests of fluoroscopic systems should be performed

A)daily.
B)weekly.
C)semiannually.
D)annually.

Question 6

Which type of test tool may be used to demonstrate pincushion distortion?

A)Dosimeter
B)Wire mesh tool
C)Ion chamber
D)Homogenous phantom

Question 7

The television camera most commonly used to capture the fluoroscopic image from a tube type image intensifier is the:

A)image orthicon.
B)plumbicon.
C)vidicon.
D)charge-coupled device.

Question 8

In standard broadcast television, one image frame consists of

A)one television field.
B)two television fields.
C)262.5 scan lines.
D)17 ms.

Question 9

Performance testing of fluoroscopic systems must include all the following except

A)x-ray tube housing.
B)automatic film processor.
C)total filtration.
D)automatic brightness control.

Question 10

A reduction in brightness at the periphery of the image captured with an image intensifier tube is referred to as

A)pincushion distortion.
B)vignetting.
C)barrel distortion.
D)quantum mottle.