CT IMAGING PROCEDURES EXAM 190 QUESTIONS &
CORRECT ANSWERS LATEST 2025
A new computed tomography (CT) protocol requires scanning the liver at exactly
25 seconds after initiating intravenous (IV) contrast injection. This can be
accomplished by which scan timing method? - ANSWER-Scan time delay
There are several ways to time a contrast bolus. If the patient is to be scanned at
a specific time after initiating contrast, the technologist will need to set the exact
scan delay time. The test bolus and bolus tracking methods cannot be used to set
exact times.
Increasing the reconstruction slice thickness results in: - ANSWER-Visualization of
more anatomy with decreased spatial resolution
Increasing the reconstruction slice thickness results in visualization of more
anatomy with decreased spatial resolution.
Increasing the reconstruction slice thickness adds more anatomic data to each
image. As a result, this allows visualization of more anatomy. The major
disadvantage of thicker slices is decreased spatial resolution. As slice thickness
increases, spatial resolution decreases.
During the monitoring phase of bolus tracking you see several images showing no
contrast at all. Possible explanations include:
-The contrast injection was never initiated
-The contrast has infiltrated
,-The saline and contrast syringes were loaded backwards
-All of the answer options listed are correct - ANSWER-All of the answer options
listed are correct
This is a bad situation! Several things might have gone wrong, including all
scenarios listed. Hopefully, the technologist simply forgot to start the contrast
infection. More likely, the contrast has infiltrated and is filling the patient's arm.
In some cases, the technologist may load these syringes backwards, which results
in saline flowing through the body during the scan rather than contrast.
Which of the following is a potential reason to DECREASE the IV contrast volume
used during a CT scan?
-Angiographic scanning
-Pediatric scanning
-Slow scanner speed
-Long scan length - ANSWER-Pediatric scanning
The IV contrast volume is commonly decreased for smaller patients, especially
pediatric patients. The other options listed, late require an increase in contrast
volume.
Which phase of contrast enhancement in the abdomen peaks at 50-60 seconds
after initiating intravenous (IV) injection? - ANSWER-Portal venous phase
Contrast enhancement through the abdomen occurs in this order: 1) arterial
phase at about 30 seconds, 2) portal venous phase at about 60 seconds, and 3)
delayed phase at about 5 minutes (or more).
,The acquisition slice thickness used during a scan is determined by the
technologist. Acquisition thickness refers to which of the following?
-Thickness of activated detector rows
-Thickness of anatomical data averaged into each image
-Total width of the x-ray beam
-Space between adjacent slices - ANSWER-Thickness of activated detector rows
By definition, the acquisition thickness is the thickness of activated detector rows.
The thickness of these rows can be changed by combining rows together.
Acquisition thickness is NOT the same as reconstruction slice thickness (the
thickness of anatomical data averaged into each image).
Which of these venous access devices are sometimes labeled for CT power
injection?
-Central lines (port)
-Dialysis catheters
-Jugular lines - ANSWER-Central lines (port)
Some Central lines, called ports, are labeled to be used for CT power injection.
Dialysis catheters in jugular lines are almost never intended to be used for power
injection.
Displayed CT images are processed to display a specific amount of anatomical
data in each image. This is the: - ANSWER-Reconstruction slice thickness
, The reconstruction slice thickness refers to the thickness of anatomical data
averaged into each image. Thinner slices have better spatial resolution, but
thicker slices have less noise.
Which two contrast injection methods are useful for precisely timed angiographic
procedures?
Scan delay time
Test bolus
Bolus tracking
Fixed time delay - ANSWER-Test bolus
Bolus tracking
The test bolus method and bolus tracking methods are both used to precisely
time angiographic scans with maximum contrast enhancement.
These methods are preferred over setting a simple scan delay time because each
patient can be slightly different.
Consider a patient admitted to the emergency department for flank pain,
hematuria, and suspected renal stone. CT imaging for the initial assessment of the
collecting system should be performed during which phase of contrast
enhancement? - ANSWER-Non-contrast
Evaluation for renal stone should initially be performed without contrast. Renal
stones appear white, and contrast also appears as white. The use of contrast
could disguise the presence of renal stones, therefore, renal stones are best
identified without the use of intravenous contrast.
CORRECT ANSWERS LATEST 2025
A new computed tomography (CT) protocol requires scanning the liver at exactly
25 seconds after initiating intravenous (IV) contrast injection. This can be
accomplished by which scan timing method? - ANSWER-Scan time delay
There are several ways to time a contrast bolus. If the patient is to be scanned at
a specific time after initiating contrast, the technologist will need to set the exact
scan delay time. The test bolus and bolus tracking methods cannot be used to set
exact times.
Increasing the reconstruction slice thickness results in: - ANSWER-Visualization of
more anatomy with decreased spatial resolution
Increasing the reconstruction slice thickness results in visualization of more
anatomy with decreased spatial resolution.
Increasing the reconstruction slice thickness adds more anatomic data to each
image. As a result, this allows visualization of more anatomy. The major
disadvantage of thicker slices is decreased spatial resolution. As slice thickness
increases, spatial resolution decreases.
During the monitoring phase of bolus tracking you see several images showing no
contrast at all. Possible explanations include:
-The contrast injection was never initiated
-The contrast has infiltrated
,-The saline and contrast syringes were loaded backwards
-All of the answer options listed are correct - ANSWER-All of the answer options
listed are correct
This is a bad situation! Several things might have gone wrong, including all
scenarios listed. Hopefully, the technologist simply forgot to start the contrast
infection. More likely, the contrast has infiltrated and is filling the patient's arm.
In some cases, the technologist may load these syringes backwards, which results
in saline flowing through the body during the scan rather than contrast.
Which of the following is a potential reason to DECREASE the IV contrast volume
used during a CT scan?
-Angiographic scanning
-Pediatric scanning
-Slow scanner speed
-Long scan length - ANSWER-Pediatric scanning
The IV contrast volume is commonly decreased for smaller patients, especially
pediatric patients. The other options listed, late require an increase in contrast
volume.
Which phase of contrast enhancement in the abdomen peaks at 50-60 seconds
after initiating intravenous (IV) injection? - ANSWER-Portal venous phase
Contrast enhancement through the abdomen occurs in this order: 1) arterial
phase at about 30 seconds, 2) portal venous phase at about 60 seconds, and 3)
delayed phase at about 5 minutes (or more).
,The acquisition slice thickness used during a scan is determined by the
technologist. Acquisition thickness refers to which of the following?
-Thickness of activated detector rows
-Thickness of anatomical data averaged into each image
-Total width of the x-ray beam
-Space between adjacent slices - ANSWER-Thickness of activated detector rows
By definition, the acquisition thickness is the thickness of activated detector rows.
The thickness of these rows can be changed by combining rows together.
Acquisition thickness is NOT the same as reconstruction slice thickness (the
thickness of anatomical data averaged into each image).
Which of these venous access devices are sometimes labeled for CT power
injection?
-Central lines (port)
-Dialysis catheters
-Jugular lines - ANSWER-Central lines (port)
Some Central lines, called ports, are labeled to be used for CT power injection.
Dialysis catheters in jugular lines are almost never intended to be used for power
injection.
Displayed CT images are processed to display a specific amount of anatomical
data in each image. This is the: - ANSWER-Reconstruction slice thickness
, The reconstruction slice thickness refers to the thickness of anatomical data
averaged into each image. Thinner slices have better spatial resolution, but
thicker slices have less noise.
Which two contrast injection methods are useful for precisely timed angiographic
procedures?
Scan delay time
Test bolus
Bolus tracking
Fixed time delay - ANSWER-Test bolus
Bolus tracking
The test bolus method and bolus tracking methods are both used to precisely
time angiographic scans with maximum contrast enhancement.
These methods are preferred over setting a simple scan delay time because each
patient can be slightly different.
Consider a patient admitted to the emergency department for flank pain,
hematuria, and suspected renal stone. CT imaging for the initial assessment of the
collecting system should be performed during which phase of contrast
enhancement? - ANSWER-Non-contrast
Evaluation for renal stone should initially be performed without contrast. Renal
stones appear white, and contrast also appears as white. The use of contrast
could disguise the presence of renal stones, therefore, renal stones are best
identified without the use of intravenous contrast.
