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CT SEAL EXAM QUESTIONS THE CORRECT ANSWERS
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CT SEAL EXAM QUESTIONS THE CORRECT ANSWERS
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CT SEAL EXAM QUESTIONS THECORRECT ANSWERS
The scan delay for a CT Abdomen Pelvis exam is:
15 seconds.
30 seconds.
65 seconds.
2 minutes. - Answer- 65
The matrix is: the portion of the detector that gathers z-axis data.
the portion of the detector that gathers x- and y-axis data.
a grid of pixels aligned in rows and columns.
a cube of voxels. - Answer- a grid of pixels aligned in rows and columns.
Which of the following is a clinical indication for CT colonography?
Adrenal mass
Incomplete colonoscopy
Crohn's disease
Abscess - Answer- Incomplete colonoscopy
Images are acquired along the ______ of the patient as they move through the scanner.
x-axis
y-axis
z-axis
slice - Answer- z axis
Which of the following HU ranges is most likely for a maximum intensity projection
(MIP)?
-1000 to +500
-500 to 0
0 to +500
+500 to +1000 - Answer- +500 to +1000
The appropriate window width for displaying the brain is:
wide.
narrow.
a soft tissue window.
a lung window. - Answer- narrow
How do bowtie filters reduce patient dose?
Bowtie filters reduce beam intensity peripherally, corresponding to the thinner area of
the patient's body.
Bowtie filters decrease beam intensity centrally, corresponding to the thicker area of the
patient's body.
,Bowtie filters have no effect on patient dose.
Bowtie filters reduce the intensity of the entire x-ray beam, reducing dose - Answer-
Bowtie filters reduce beam intensity peripherally, corresponding to the thinner area of
the patient's body.
Which window width and window level will demonstrate bony structures without soft
tissue details?
WW: 2000, WL: 500
WW: 350, WL: 50
WW: 100, WL: 30
WW: 1500, WL: -150 - Answer- WW: 2000, WL: 500
What is the scan delay for a CT Brain exam to evaluate a lesion?
45 seconds
2 minutes
5 minutes
7 minutes - Answer- 5 minutes
Filtration in CT affects patient dose:
by removing the high quality x-rays from the x-ray beam.
by removing the low quality x-rays from the x-ray beam.
by widening the beam path.
by narrowing the beam path. - Answer- by removing the low quality x-rays from the x-
ray beam.
When a voxel contains more than one tissue type, the CT number for each tissue is
averaged together creating a:
partial volume artifact.
ring artifact.
beam hardening artifact.
alias artifact. - Answer- partial volume artifact.
What type of contrast is recommended for a CT Urogram?
Air (negative contrast)
Barium
Volumen
IV iodinated contrast - Answer- IV iodinated contrast
A CT of the orbits to rule out a foreign body includes:
axial reformats.
coronal and axial reformats.
axial, coronal, and sagittal reformats.
coronal reformats. - Answer- axial, coronal, and sagittal reformats.
How much IV contrast is administered for a HRCT?
60 mL
, 80 mL
100 mL
No IV contrast - Answer- No IV contrast
With overlapping slices of a MDCT scan, the multiple-scan average dose will:
decrease.
increase.
remain constant.
halve. - Answer- increase
The scan field of view (SFOV) affects:
quantity of raw data.
pixel size.
matrix size.
spatial resolution. - Answer- quantity of raw data.
For a routine CT Chest, the patient should be positioned:
1. arms above their head.
2. headfirst into the gantry.
3. prone. - Answer- 1. arms above their head.
2. headfirst into the gantry.
Isotropic imaging improves:
spatial resolution.
contrast resolution.
temporal resolution.
patient dose. - Answer- spatial resolution.
The right and left coronary arteries originate from the:
ascending aorta.
aortic arch.
pulmonary trunk.
descending aorta. - Answer- ascending aorta.
A CT Calcium Scoring exam assesses plaque deposits. What is the calcium score
range for a moderate presence of plaque?
1 to 10
11 to 100
101 to 400
More than 400 - Answer- 101 to 400
The CT technologist can control all of the following, except:
pitch.
slice thickness.
scan time.
filtration. - Answer- filtration.
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