ARRT Registry Practice Test Already
Solved to Score A+
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 - 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
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.
Solved to Score A+
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 - 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
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.
