ARRT REGISTRY EXAM EXAMINATION TEST
2026 FULL SOLUTION SET WITH VERIFIED
CORRECT ANSWERS
⩥ Of the following, the greatest attenuator of x-rays is:
a. air
b. bone
c. muscle
d. fat. 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. 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.
⩥ The _____ vein is BEST suited for venipuncture.
a. basilic
b. popliteal
c. femoral
d. right internal jugular. 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. Answer: c. 7
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. 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. Answer: c. seconds
The AEC device is designed to control the time of exposure. The
remaining technical factors are chosen by the radiographer.
⩥ The ______ receives electrons immediately after they are read out
from an imaging detector.
a. transformer
b. helium neon laser
c. liquid crystal display
, d. analog-to-digital converter. Answer: d. analog-to-digital converter
Electrons are analog data. Once they leave the detector, they are sent to
the analog-to-digital converter for sampling and quantization. Hence, the
image is converted into a digital image.
⩥ An image that has many shades of gray with few differences among
them is defined as exhibiting:
a. high spatial resolution
b. low contrast
c. high dynamic range
d. low bit depth. Answer: b. low contrast
Low-contrast images consist of many gray shades with very little
differences among the shades. These images are also referred to as
exhibiting long-scale contrast. Spatial resolution deals with image
sharpness and dynamic range is the imaging detector's range of response
to exposures. Bit depth has to do with the number of gray shades that a
system can yield. A low bit depth system would actually result in an
image that displays few shades of gray. In other words, the image would
appear more black and white.
⩥ Which of the following structures is located in the mediastinum?
a. right middle lobe and esophagus
b. left upper lobe and heart
2026 FULL SOLUTION SET WITH VERIFIED
CORRECT ANSWERS
⩥ Of the following, the greatest attenuator of x-rays is:
a. air
b. bone
c. muscle
d. fat. 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. 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.
⩥ The _____ vein is BEST suited for venipuncture.
a. basilic
b. popliteal
c. femoral
d. right internal jugular. 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. Answer: c. 7
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. 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. Answer: c. seconds
The AEC device is designed to control the time of exposure. The
remaining technical factors are chosen by the radiographer.
⩥ The ______ receives electrons immediately after they are read out
from an imaging detector.
a. transformer
b. helium neon laser
c. liquid crystal display
, d. analog-to-digital converter. Answer: d. analog-to-digital converter
Electrons are analog data. Once they leave the detector, they are sent to
the analog-to-digital converter for sampling and quantization. Hence, the
image is converted into a digital image.
⩥ An image that has many shades of gray with few differences among
them is defined as exhibiting:
a. high spatial resolution
b. low contrast
c. high dynamic range
d. low bit depth. Answer: b. low contrast
Low-contrast images consist of many gray shades with very little
differences among the shades. These images are also referred to as
exhibiting long-scale contrast. Spatial resolution deals with image
sharpness and dynamic range is the imaging detector's range of response
to exposures. Bit depth has to do with the number of gray shades that a
system can yield. A low bit depth system would actually result in an
image that displays few shades of gray. In other words, the image would
appear more black and white.
⩥ Which of the following structures is located in the mediastinum?
a. right middle lobe and esophagus
b. left upper lobe and heart
