ARRT CT Registry Exam
(2024/2025) Questions with Correct
Detailed Answers || Already Graded
A+
<RECENT VERSION>
What is most likely to have the highest osmolality - ANSWER An ionic IV
contrast agent
Ionic agents dissociate into - ANSWER ions in solution
What ty...
What is most likely to have the highest osmolality - ANSWER ✔ An ionic IV
contrast agent
Ionic agents dissociate into - ANSWER ✔ ions in solution
What types of contrast would be administered for a CT study of the lumbosacral
spine? - ANSWER ✔ Contrast agents are generally not administered unless there is
a suspected mass.
To evaluate a mass, iodinated IV contrast is typically administered.
If post-pyelogram, intrathecal contrast would have been previously administered.
Which studies might cranial nerve XI be visualized? - ANSWER ✔ soft tissue
neck
In order to generate a diagnostic 3D reconstruction of the hips, the reconstruction
software utilizes - ANSWER ✔ the axial image data
,What is the appropriate range of coverage for a coronal sinus study? - ANSWER
✔ From the dorsum sella to the anterior aspect of the frontal sinus
What is a reason for using thinner slices in the posterior fossa compared with the
more superior regions of the brain? - ANSWER ✔ To reduce beam hardening
artifacts
to improve spatial resolution
A localizer image of what orientations should be used to set up axial slices so that
they can be angled parallel to the plane of a specific lumbar disk? - ANSWER ✔
Lateral
Intravenous contrast is not administered to rule out - ANSWER ✔ a herniated disk
Axial slices are not generally acquired through the entire thoracic spine, but rather
through - ANSWER ✔ a few specified disk spaces.
It is impossible to position an adult in such a way that one could directly obtain -
ANSWER ✔ sagittal or coronal images. These are reformatted from the axial
images.
What is a location where one would expect to find cerebral spinal fluid? -
ANSWER ✔ Subarachnoid space
Fourth ventricle of the brain
What is the expected result of a CT number calibration test performed on a water
phantom? - ANSWER ✔ 0 +/-3
,If the system fails the CT number standard deviation test, what is most likely? -
ANSWER ✔ Detector noise has increased
mA is a measurement of? - ANSWER ✔ The electron current from cathode to
anode
What determines slice thickness? - ANSWER ✔ Pre-patient collimation
If the patient table of a spiral, or helical, scanner is moved at a rate of 0.6cm per
gantry rotation, and a pitch of 1.5 is selected what will be the slice thickness? -
ANSWER ✔ 4mm
6mm/1.5=4mm
Slice thickness is equal to? - ANSWER ✔ the table incrementation rate divided by
the pitch
What may be the cause of two parallel black lines seen on a localizer image of a
third- or fourth-generation scanner? - ANSWER ✔ Two faulty detector elements
How would we expect metal to affect the appearance of a localizer image? -
ANSWER ✔ Any metal within the scan field-of-view may create an artifact.
Streaks caused by a combo of beam hardening, the edge gradient effect, the partial
volume effect , and motion.
Why must we choose a scan field-of-view which is larger than the anatomy to be
scanned? - ANSWER ✔ to avoid out-of-field artifcacts
, One of the most common equipment induced artifacts is the result of - ANSWER
✔ a faulty or miscalibrated detector element.
On a third-generation scanner, if there is a problem with a single detector, it will
be represented as a - ANSWER ✔ ring on the CT images
Ring artifacts are rarely seen on which generation of scanners? - ANSWER ✔
Fourth-generation, and when apparent the cause is usually an error in the back
projection of the reconstruction process
Beam hardening refers to - ANSWER ✔ the increase in the mean energy of the
photons that reach the detectors
What might increase the possibility of motion artifacts occurring? - ANSWER ✔
using no straps or pads so that the patient feels comfortable and unrestricted.
What is the cause of aliasing artifacts - ANSWER ✔ Collecting too few data
samples
what would reduce the partial volume effect? - ANSWER ✔ decreased slice
thickness
What would increase the severity of the edge gradient effect? - ANSWER ✔ a
scanner with a low data sampling rate
what affects the severity of metal artifacts? - ANSWER ✔ the quality,
composition and shape of the metal
the slice thickness
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller ProfBenjamin. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.99. You're not tied to anything after your purchase.
