ASRT EXAM QUESTIONS AN ANSWERS
The AEC controls which of the following exposure variables?
kVp
FSS
Seconds
mA - 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 - 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 - 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 - 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 - 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 - Answers - 150mSv for occupational exp. to lens of eye
The ______ sphincter prevents reflux of stomach contents into the esophagus.
pyloric
,cardiac
ileocecal
duodenal - 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 - Answers - 0 - because of the 100% voltage ripple
Which of the following is NOT part of the needle?
cannula
hub
bevel
plunger - 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 - 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 - Answers - 1 and 2
3,000 and 10,000
The sampling frequency of an imaging system determines the
pixel size
bit depth
dynamic range
detective quantum efficiency - Answers - pixel size - as sampling frequency increases
pixel size decreases because more data points are being included to represent the
image
The MOST common subcutaneous sites for drug injections are the:
abdomen and outer thighs
outer thighs and deltoid muscle
deltoid muscle and abdomen
, gluteal folds and outer thighs - Answers - abdomen and outer thighs
Fracture at the base of the first metacarpal is a _____ fracture. - Answers - Bennett -
first metacarpal
The hub of a needle is the: - Answers - point where the needle attaches to the syringe
What component is commonly replacing the vidicon camera found in older fluoro units?
plumicon camera
charge-coupled device
image intensifier
beam-splitting mirror - Answers - charge-coupled device --- (vidicon replacement)
All of the following affect tube output EXCEPT FOR:
focal spot size
target material
filtration
kVp - Answers - focal spot size
Increasing the kVp from 70 to 80 will result in an increase in all of the following EXCEPT
the _________ of _________ photons.
quantity; bremsstrahlung
quantity; characteristic
quality; bremsstrahlung
quality; characteristic - Answers - quality; characteristic - characteristic photons remain
unchanged because they are dependent on the binding energies of the TARGET
material
The AP axial oblique projections of the c-spine demonstrate the ________ that are
__________ the image receptor.
zyga joints; closest to
zyga joints; farthest from
intervertebral fora.; closest to
intervertebral fora.; farthest from - Answers - intervertebral foramina; farthest from
Which of the following radiographic evaluation criterion demonstrates NO TILT on a PA
projection of the chest?
sternal ends of the clavicles equidistant from vertebral column
T4 superimposed on the manubrium
scapulae projected outside the lung field
10 posterior ribs visible above diaphragm - Answers - T4 superimposed on manubrium
The AP axial projection of the c-spine must demonstrate:
levels C1 - C7
levels C3 - T2
levels C1 - T1
The AEC controls which of the following exposure variables?
kVp
FSS
Seconds
mA - 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 - 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 - 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 - 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 - 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 - Answers - 150mSv for occupational exp. to lens of eye
The ______ sphincter prevents reflux of stomach contents into the esophagus.
pyloric
,cardiac
ileocecal
duodenal - 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 - Answers - 0 - because of the 100% voltage ripple
Which of the following is NOT part of the needle?
cannula
hub
bevel
plunger - 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 - 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 - Answers - 1 and 2
3,000 and 10,000
The sampling frequency of an imaging system determines the
pixel size
bit depth
dynamic range
detective quantum efficiency - Answers - pixel size - as sampling frequency increases
pixel size decreases because more data points are being included to represent the
image
The MOST common subcutaneous sites for drug injections are the:
abdomen and outer thighs
outer thighs and deltoid muscle
deltoid muscle and abdomen
, gluteal folds and outer thighs - Answers - abdomen and outer thighs
Fracture at the base of the first metacarpal is a _____ fracture. - Answers - Bennett -
first metacarpal
The hub of a needle is the: - Answers - point where the needle attaches to the syringe
What component is commonly replacing the vidicon camera found in older fluoro units?
plumicon camera
charge-coupled device
image intensifier
beam-splitting mirror - Answers - charge-coupled device --- (vidicon replacement)
All of the following affect tube output EXCEPT FOR:
focal spot size
target material
filtration
kVp - Answers - focal spot size
Increasing the kVp from 70 to 80 will result in an increase in all of the following EXCEPT
the _________ of _________ photons.
quantity; bremsstrahlung
quantity; characteristic
quality; bremsstrahlung
quality; characteristic - Answers - quality; characteristic - characteristic photons remain
unchanged because they are dependent on the binding energies of the TARGET
material
The AP axial oblique projections of the c-spine demonstrate the ________ that are
__________ the image receptor.
zyga joints; closest to
zyga joints; farthest from
intervertebral fora.; closest to
intervertebral fora.; farthest from - Answers - intervertebral foramina; farthest from
Which of the following radiographic evaluation criterion demonstrates NO TILT on a PA
projection of the chest?
sternal ends of the clavicles equidistant from vertebral column
T4 superimposed on the manubrium
scapulae projected outside the lung field
10 posterior ribs visible above diaphragm - Answers - T4 superimposed on manubrium
The AP axial projection of the c-spine must demonstrate:
levels C1 - C7
levels C3 - T2
levels C1 - T1
