ARRT Registry Practice Test #1 Questions and Answers Latest
ARRT Registry Practice Test #1 Questions
and Answers Latest
Question 1
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).
Question 2
Of the following, the greatest attenuator of x-rays is:
a. air
b. bone
c. muscle
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.
Page 1 of 41
, ARRT Registry Practice Test #1 Questions and Answers Latest
Question 3
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.
Question 4
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.
Page 2 of 41
, ARRT Registry Practice Test #1 Questions and Answers Latest
Question 5
Primary radiation barriers must be AT LEAST ____ feet high.
a. 5
b. 6
c. 7
d. 8
Correct Answer
c. 7
Primary protective barriers are required to be 7 feet high from the door.
Question 6
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.
Question 7
The AEC controls which of the following exposure variables?
a. kVp
b. focal spot size
Correct Answer
c. seconds
The AEC device is designed to control the time of exposure. The remaining technical
factors are chosen by the radiographer.
Page 3 of 41
, ARRT Registry Practice Test #1 Questions and Answers Latest
Question 8
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 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.
Question 9
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 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.
Page 4 of 41
ARRT Registry Practice Test #1 Questions
and Answers Latest
Question 1
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).
Question 2
Of the following, the greatest attenuator of x-rays is:
a. air
b. bone
c. muscle
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.
Page 1 of 41
, ARRT Registry Practice Test #1 Questions and Answers Latest
Question 3
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.
Question 4
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.
Page 2 of 41
, ARRT Registry Practice Test #1 Questions and Answers Latest
Question 5
Primary radiation barriers must be AT LEAST ____ feet high.
a. 5
b. 6
c. 7
d. 8
Correct Answer
c. 7
Primary protective barriers are required to be 7 feet high from the door.
Question 6
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.
Question 7
The AEC controls which of the following exposure variables?
a. kVp
b. focal spot size
Correct Answer
c. seconds
The AEC device is designed to control the time of exposure. The remaining technical
factors are chosen by the radiographer.
Page 3 of 41
, ARRT Registry Practice Test #1 Questions and Answers Latest
Question 8
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 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.
Question 9
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 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.
Page 4 of 41
