ARRT Registry Practice Test #1 Exam
Questions and Answers (Latest
Update 2026)
All of the following EXCEPT ___ will result in an increase in AEC
response time.
a. decreasing the kVp
b. Increasing the focal spot size
c. increasing the part thickness
d. increasing the SID -
correct answer ✅b. increasing the focal spot size
Increasing the focal spot size does not change the AEC response
time It affects the spatial resolution. Decreasing the kVp increases
the exposure time because more photons are absorbed, resulting in
fewer reaching the cell(s). The same is true for increasing part
thickness. Increasing the SID results in a longer exposure time
because of beam divergence and the decrease in the number of
photons reaching the cell(s).
Of the following, the greatest attenuator of x-rays is:
a. air
b. bone
c. muscle
,ARRT Registry Practice Test #1 Exam
Questions and Answers (Latest
Update 2026)
d. fat -
correct answer ✅b. bone
Air allows for the greatest transmission of x-rays. The probability of
bone and soft tissue (muscle, fat) attenuating x-rays via Compton
interactions is roughly the same. However, since bone has a higher
effective atomic number than soft tissue, bone attenuates more x-
rays via photoelectric interactions.
The ______ sinus(es) sit(s) directly beneath the sella turcica.
a. ethmoidal
b. frontal
c. maxillary
d. sphenoidal -
correct answer ✅d. sphenoidal
The sphenoidal sinuses are usually paired (2) and are in the body of
the sphenoid bone. The sinuses lie below the sella turcica and
extend between the posterior ethmoidal air cells and the dorsal
sellae.
,ARRT Registry Practice Test #1 Exam
Questions and Answers (Latest
Update 2026)
The _____ vein is BEST suited for venipuncture.
a. basilic
b. popliteal
c. femoral
d. right internal jugular -
correct answer ✅a. basilic
The basilica and cephalic veins are the 2 most common sites of
venipuncture. The popliteal and femoral veins are in the lower
extremities, which are harder to access and should only be used in
cases of emergency. The right internal jugular vein is more
commonly used for central venous access and is not a common site
for venipuncture.
Primary radiation barriers must be AT LEAST ____ feet high.
a. 5
b. 6
c. 7
d. 8 -
correct answer ✅c. 7
, ARRT Registry Practice Test #1 Exam
Questions and Answers (Latest
Update 2026)
Primary protective barriers are required to be 7 feet high from the
door.
The ____ sphincter prevents reflux of stomach contents into the
esophagus.
a. pyloric
b. cardiac
c. ileocecal
d. duodenal -
correct answer ✅b. cardiac
The cardiac sphincter is located at the esophagogastric junction.
When working properly, it prevents back flow of stomach contents
into the esophagus.
The AEC controls which of the following exposure variables?
a. kVp
b. focal spot size -
correct answer ✅c. seconds
Questions and Answers (Latest
Update 2026)
All of the following EXCEPT ___ will result in an increase in AEC
response time.
a. decreasing the kVp
b. Increasing the focal spot size
c. increasing the part thickness
d. increasing the SID -
correct answer ✅b. increasing the focal spot size
Increasing the focal spot size does not change the AEC response
time It affects the spatial resolution. Decreasing the kVp increases
the exposure time because more photons are absorbed, resulting in
fewer reaching the cell(s). The same is true for increasing part
thickness. Increasing the SID results in a longer exposure time
because of beam divergence and the decrease in the number of
photons reaching the cell(s).
Of the following, the greatest attenuator of x-rays is:
a. air
b. bone
c. muscle
,ARRT Registry Practice Test #1 Exam
Questions and Answers (Latest
Update 2026)
d. fat -
correct answer ✅b. bone
Air allows for the greatest transmission of x-rays. The probability of
bone and soft tissue (muscle, fat) attenuating x-rays via Compton
interactions is roughly the same. However, since bone has a higher
effective atomic number than soft tissue, bone attenuates more x-
rays via photoelectric interactions.
The ______ sinus(es) sit(s) directly beneath the sella turcica.
a. ethmoidal
b. frontal
c. maxillary
d. sphenoidal -
correct answer ✅d. sphenoidal
The sphenoidal sinuses are usually paired (2) and are in the body of
the sphenoid bone. The sinuses lie below the sella turcica and
extend between the posterior ethmoidal air cells and the dorsal
sellae.
,ARRT Registry Practice Test #1 Exam
Questions and Answers (Latest
Update 2026)
The _____ vein is BEST suited for venipuncture.
a. basilic
b. popliteal
c. femoral
d. right internal jugular -
correct answer ✅a. basilic
The basilica and cephalic veins are the 2 most common sites of
venipuncture. The popliteal and femoral veins are in the lower
extremities, which are harder to access and should only be used in
cases of emergency. The right internal jugular vein is more
commonly used for central venous access and is not a common site
for venipuncture.
Primary radiation barriers must be AT LEAST ____ feet high.
a. 5
b. 6
c. 7
d. 8 -
correct answer ✅c. 7
, ARRT Registry Practice Test #1 Exam
Questions and Answers (Latest
Update 2026)
Primary protective barriers are required to be 7 feet high from the
door.
The ____ sphincter prevents reflux of stomach contents into the
esophagus.
a. pyloric
b. cardiac
c. ileocecal
d. duodenal -
correct answer ✅b. cardiac
The cardiac sphincter is located at the esophagogastric junction.
When working properly, it prevents back flow of stomach contents
into the esophagus.
The AEC controls which of the following exposure variables?
a. kVp
b. focal spot size -
correct answer ✅c. seconds
