Chapter 15 Quiz

Question 1

The commercial fluoroscope was developed by:

a.) newton
b.) rutherford
c.) einstein
d.) edison

Answer 1

d.) edison

Question 2

The newest fluoroscopy systems use a flat panel detector

a.) to record the overhead images following fluoroscopy
b.) in addition to the image intensifier
c.) to record the spot images during fluoroscopy
d.) in place of the image intensifier

Answer 2

d.) in place of the image intensifier

Question 3

A loss of brightness around the edge of the fluoroscopic image caused by the curve of the photocathode is:

a.) pincushion appearance
b.) vignetting
c.) magnification
d.) noise

Answer 3

b.) vignetting

Question 4

Amorphus selenium is used as the:

a.) photodetector for direct capture DR imaging
b.) photoconductor for indirect capture DR imaging
c.) photoconductor for direct capture DR Imaging
d.) photodetector for indirect capture DR imaging

Answer 4

c.) photoconductor for direct capture DR imaging

Question 5

Quantam mottle, or noise, occurs beacause of what?

Answer 5

insufficient mas

Question 6

This part of the image intensifier absorbs light and produces electrons.

a.) output phosphor
b.) input phosphor
c.) photocathode
d.) electrostatic focusing lens

Answer 6

c.) Photocathode

Question 7

In an indirect capture DR system, the electronic components that are configured in a network of detector elements is the:

a.) charge coupled device (CCD)
b.) scintillator
c.) photoconductor
d.) thin film transistor

Answer 7

d.) thin film transistor

Question 8

Which of the following is/are associated with magnification in fluoroscopy?
1.) increased mA
2.) smaller portion of the input phosphor is used
3.) image intensifier focal point moves closer to the output phosphor

a.) 2 and 3 only
b.) 1 only
c.) 1 and 2 only
d.) 1, 2 and 3 only

Answer 8

c.) 1 and 2 only

Question 9

Distortion of the fluoroscopic image that appears as unequal magnification is:

a.) magnification
b.) pincushion appearance
c.) vignetting
d.) noise

Answer 9

b.) pincushion appearance

Question 10

In mobile fluoroscopy, the closer the image intensifier to the patient, the higher the patient dose.

a.) true
b.) false

Answer 10

b.) false

Question 11

Flat panel detectors for fluoroscopic imaging can be the:

a.) amorphous selenium direct capture detector
b.) cesium iodide amorphus slicon indirect capture detector
c.) amorphus silicon direct capture detector
d.) a and b

Answer 11

d.) a and b

Question 12

A common site for mobile fluoro is:

Answer 12

in the OR

Question 13

In radiographic image intensification, the ratio of the number of light photons at the output phosphor to the number of photons at the input phosphor describes.

a.) brightness gain
b.) flux gain
c.) conversion factor
d.) minification gain

Answer 13

b.) flux gain

Question 14

A disadvantage of using magnification mode during fluoroscopy using an image intensifier is:

a.) the patient receives additional dose
b.) none of the above
c.) the image brightness is inconsistent
d.) the image has less resolution

Answer 14

a.) the patient receives additional dose

Question 15

The purpose of the 5 minute timer in fluoro is:

a.) terminate exposure once the maximumtime has been reached
b.) inform the radiographer of equipment malfunction
c.) open the circuit
d.) alert the radiographer

Answer 15

d.) alert the radiographer

Question 16

Which of the following is composed of cesium iodide?

a.) conventional fluorscopic screen
b.) intensifier photocathode
c.) intensifier input phosphor
d.) intensifier output phosphor

Answer 16

c.) intensifier input phosphor

Question 17

Magnification fluoroscopy is accomplished by:
1.) moving the image intensifier focal point further from the output phosphor
2.) selecting a smaller portion of the input phosphor
3.) decreasing the voltage to the electrostatic focusing lense

a.) 1, 2 and 3
b.) 1 only
c.) 2 and 3 only
d.) 1 and 2 only

Answer 17

d.) 1 and 2 only

Question 18

The only time people in the fluro room are actually recieveing radiation exposure is:

a.) only for 1 minute during the exposure
b.) only when the buzzer is sounding
c.) when the fluoro unit is turned on
d.) when the deadman switch is activated

Answer 18

d.) when the dead man switch is activated

Question 19

The output phosphor is made of:

a.) cesium and antimony
b.) zinc and cadmium
c.) cesium iodide
d.) zinc and antimony

Answer 19

b.) zinc and cadmium