ARRT Registry Practice Test #1 with
correct answers 100% 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 Answers 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
d. fat - Correct Answers 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 Answers 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 - Correct Answers 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 Answers 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 - Correct Answers 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 Answers 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 - Correct Answers 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 - Correct Answers 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
c. aorta and thyroid
d. trachea and thymus - Correct Answers d. trachea and thymus
Structures located in the mediastinum are the heart, great vessels, trachea, esophagus, thymus,
lymphatics, nerves, fibrous tissue, and fat.
A terminally ill patient has asked the doctor about possible volunteer opportunities in the
hospital. She says that if she can volunteer in the hospital, she might be able to extend her life a
bit longer from doing good deeds. This represents the ____ stage of grief for the patient.
a. bargaining
b. anger
c. denial
d. depression - Correct Answers a. bargaining
correct answers 100% 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 Answers 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
d. fat - Correct Answers 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 Answers 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 - Correct Answers 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 Answers 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 - Correct Answers 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 Answers 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 - Correct Answers 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 - Correct Answers 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
c. aorta and thyroid
d. trachea and thymus - Correct Answers d. trachea and thymus
Structures located in the mediastinum are the heart, great vessels, trachea, esophagus, thymus,
lymphatics, nerves, fibrous tissue, and fat.
A terminally ill patient has asked the doctor about possible volunteer opportunities in the
hospital. She says that if she can volunteer in the hospital, she might be able to extend her life a
bit longer from doing good deeds. This represents the ____ stage of grief for the patient.
a. bargaining
b. anger
c. denial
d. depression - Correct Answers a. bargaining
