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Rad135 Final Exam Review- Part 5
Test Description: This content covers several chapters from the text to help you prepare for the final exam in Rad135.
Instructions: Answer all questions to get your test result.
1) Digitization of the fluoroscopic image permits
A
image postprocessing
B
all of the above
C
transfer to PACS
D
electronic archival
2) What is the range for milliampere (mA) on a conventional fluoroscopic unit?
A
5.0-10.0 mA
B
1.0-10.0 mA
C
0.1-1.0 mA
D
0.5-5.0 mA
3) Which of the following converts light to electrons?
A
electrostatic lenses
B
photocathode
C
focal spot
D
output phosphor
4) Which of the following are the charged electrodes found on the inside of the glass envelope of the image intensifier?
A
output phosphor
B
electrostatic lenses
C
magnifying tube
D
input fluorescent screens
5) What is the magnification factor for an image intensifying tube with an input screen diameter of 8 inches and an mag input diameter of 1 inch?
A
0.125
B
64
C
8
D
0.03=6
6) Which of the following terms is used to describe a blotchy or grainy appearance produced by a lack of radiation while trying to produce a uniform image?
A
quantum mottle
B
distortion
C
resolution
D
contrast
7) Which of the following will increase the patient dose during chest fluoroscopy?
A
utilizing magnification mode
B
using pulse mode
C
the II or flat panel detector should be as close to the patient as possible.
D
placing a lead apron under the patient's pelvis.
8) Which of the following is NOT an advantage of digital over conventional fluoroscopy?
A
not affected by magnetic fields
B
data manipulation
C
last image hold
D
greater distortion of the image
9) Which of the following is an advantage of a CCD over a TV camera tube?
A
non-linear response
B
decreased DQE
C
increased noise
D
increased spatial resolution
10) What is the minimum thickness of mm Pb/eq for lead aprons?
A
0.25 mm Pb/eq
B
0.1 mm Pb/eq
C
0.2 mm Pb/eq
D
0.5 mm Pb/eq
11) What is the required thickness for bucky slot covers and fluoro curtains in mm Pb/eq?
A
0.1 mm Pb/eq
B
0.5 mm Pb/eq
C
0.25 mm Pb/eq
D
0.2 mm Pb/eq
12) What is the minimum SOD for fixed fluoroscopic units?
A
45 in
B
15 in
C
10 in
D
72 in
13) On fluoroscopic equipment, federal Law requires a ____ minute timer with an audible and visual alarm.
A
5 min
B
1 min
C
2 min
D
10 min
14) What is the maximum fluoro exposure rate at tabletop in R/min?
A
5
B
2
C
8
D
10
15) Digital detectors with a higher DQE will ____.
A
are not preferred for mammography due to dose
B
produce better images of small objects with low subject contrast
C
require more dose to image adequately
D
produce a lower S:N ratio
16) During fluoroscopic image intensification, the primary beam exits the patient and strikes the ___ of the image intensifier.
A
electrostatic lenses
B
output phosphor
C
input screen
D
photocathode
17) Fluoroscopy is a ___ x-ray examination.
A
therapeutic
B
static
C
dynamic, real time
D
unecessary
18) In a fluoroscopic system, the x-ray tube and image receptor must be interlocked in order to enable fluoroscopy. This classifies the image receptor as a ____.
A
secondary barrier
B
off-focus radiation cause
C
primary barrier
D
scatter barrier
19) Total brightness gain is ____.
A
a measure of the increase in image intensity
B
influenced by the minification gain
C
all of the above
D
influenced by the flux gain
20) Barium is a good contrast agent because of its ____.
A
permeability
B
low Z number
C
high Z number
D
palatability
*select an answer for all questions
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