Term 1 of 147
Which type of vision is most commonly employed during conventional fluoroscopic exam?
Photopic
Scotopic
Mesopic
Lovotopic
Term 2 of 147
Image quality utilizing an image intensifier is improved as the size of the x-ray beam (x-ray field) is
tightly coned or collimated because:
The effective kVp increases
The effective mA increases
There is a reduction of scattered radiation reaching the output phosphor of the image
intensifier
The image becomes brighter
,Term 3 of 147
Which of the following describe the correct usage of the "boost" position or high level control in
fluoroscopy?
i. Increases the tube current and potential above normal limits
ii. Automatically raises the level of the table
iii. Continuous manual activation is required
iv. Continuous audible signal is required
II only
I, III and IV only
I and II only
III and IV only
Term 4 of 147
Isoexposure contours during fluoroscopy will show that at a distance of 3 ft. from the head of the
table, the radiographer will receive:
50 mR/hr
100mR/hr
1 mR/hr
500 mR/hr
Term 5 of 147
Scintillation is proportional to the number of _______________ absorbed in the input fluorescent layer:
Photons
Ion pairs
Crystal
Movements
,Term 6 of 147
When the portable C-arm is used for an anterposterior chest view, in which direction from the
xray tube is there the most scattered radiation?
45 degrees from the primary beam
90 degrees from the primary beam
135 degrees from the primary beam
180 degrees from the primary beam
Term 7 of 147
Proper collimation of the fluoroscopic x-ray beam will:
Decrease pt exposure
Reduce scatter radiation
Improve image quality
All of the above
Term 8 of 147
The intensity of the x-ray beam at the table top of a fluoroscope should not exceed ______ for each
mA of tube current operating at 80 kVp:
2.2 R/min
4.9 R/min
5 R/min
10 R/min
, Term 9 of 147
1. levels that an individual could receive in any 1 hour, a dose in excess of:
5 mRem
50 mRem
500 mRem
100 mRem
Term 10 of 147
A 9" input screen and a 1" output screen increases brightness:
9 times
18 times
40 times
81 times
Term 11 of 147
Zinc-cadmium sulfide intensifiers have a resolving power of:
7-10 line pairs per mm
3-6 line pairs per mm
1-2 line pairs per mm
2-4 line pairs per mm
none of the above
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