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ASRT Exam with 100% correct Answers
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ASRT Exam with 100% correct Answers
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ASRT Exam with 100% correct AnswersThe AEC controls which of the following exposure variables?
kVp
FSS
Seconds
mA - Correct Answers -mA. (The AED is designed to control the time of exposure. The
other remaining factors are chosen by the radiographer.)
All of the following are within acceptable kVp accuracy variance for an exposure using
80 kVp except for ______kVp.
86
84
82
76 - Correct Answers -86 (The kVp variance is within +5%. At 80kVp the variance is
4kVp (80 x 0.05 = 4). Therefore numbers 76kVp through 84 kVp are within acceptable
limits.)
A 25-gauge, 0.5 inch needle is best used for a _______ injection.
intradermal
intramuscular
subcutaneous
intravenous - Correct Answers -subcutaneous. (25-gauge has a small diameter and
short length which will not penetrate deeply into the epidermis)
What type of device is the mA selector?
capacitor
inverter
rectifier
rheostat - Correct Answers -rheostat. (a type of variable resistor that controls the
filament temperature by adjusting the resistance applied to the filament.)
The primary function of filtration is to reduce:
patient skin dose
operator dose
film noise
scattered radiation - Correct Answers -patient skin dose
, According the NCRP Report No. 116, annual occupational exposure to the lens of the
eye should not exceed:
25mSv
50mSv
100mSv
150mSv - Correct Answers -150mSv for occupational exp. to lens of eye
The ______ sphincter prevents reflux of stomach contents into the esophagus.
pyloric
cardiac
ileocecal
duodenal - Correct Answers -cardiac - prevents reflux of stomach contents into
esophagus
If 90kVp is used with a single-phase generator, the minimum electron voltage across
the tube is _____ keV.
90
60
30
0 - Correct Answers -0 - because of the 100% voltage ripple
Which of the following is NOT part of the needle?
cannula
hub
bevel
plunger - Correct Answers -plunger not part of needle
The purpose of the rheostat in the x-ray circuitry is to:
minimize electron repulsion
monitor tube current
alter anode rotation speed
adjust filament temperature - Correct Answers -adjust filament temperature - rheostat
controlled by radiographer using the operator control panel
The speed at which the anode rotates in the rotating anode x-ray tube can be:
1. 3000rpm
2. 10,000rpm
3. 15,000rpm
1 and 2
1 and 3
2 and 3
1, 2, and 3 - Correct Answers -1 and 2
3,000 and 10,000
The sampling frequency of an imaging system determines the
pixel size
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