Exam (elaborations)
CT EXAM #2 QUESTIONS WITH COMPLETE ANSWERS
- Course
- Institution
CT EXAM #2 QUESTIONS WITH COMPLETE ANSWERS
[Show more]
Content preview
CT EXAM #2 QUESTIONS WITHCOMPLETE ANSWERS
Volume acquisition scanners are based on:
1. slice by slice data acquisition
2. Slip ring technology
3. continuous rotation of the x-ray tube
A. 1 and 2
B. 1 and 3
C. 2 and 3
D. All are correct - Answer-C. 2 and 3
Absorption efficiency refers to how efficiently x-ray photons are captured by the
detectors
True or false - Answer-True
In multidetector scanning, which of the following determines slice thickness?
A. pre-patient collimators
B. post patient collimators
C. image reconstruction parameters
D. detector type - Answer-C. Image reconstruction parameters
Window level refers to:
1. midpoint in a range of CT numbers
2. image contrast
3. image brightness
A. 1 and 2
B. 1 and 3
C. 1
D. 1 2 and 3 - Answer-B. 1 and 3
As pitch increases, patient dose _______ - Answer-Decreases
The typical modern CT scanner generator converts
A. low voltage AC to high voltage DC
B. low voltage DC to high voltage DC
, C. high voltage DC to low voltage DC
D. low voltage DC to high voltage AC - Answer-A. low voltage AC to high voltage DC
- Answer-
All spiral helical scanners incorporate copper brushes as a component of the slip ring
design
True or false - Answer-False
AS the display field of view (DFOV) decreases:
A. Noise increases
B. Spatial resolution increases
C. Spatial resolution decreases
A. 1 and 2
. 1 and 3
C. 2 and 3
D. All - Answer-A. 1 and 2
As post patient collimation decreases, slice thickness
A. decreases
B. increases
C.remains the same
D. doubles - Answer-A. decreases
The window width determines the :
A. image density
B. image contrast
C. voxels depth
D. voxel width - Answer-B. image contrast
MDCT scanners capable of collecting 64 slices in a single rotation do NOT:
a. perform conventional CT scans
b. perform helical CT scans
c. use filtered back projection as their method of image reconstruction
d. perform localizer scans - Answer-C -> single row detector scanners and scanners
that have up to four parallel detector rows may use filtered back projection for image
reconstruction. All MDCT scanners that have more than four parallel rows of detectors
apply cone beam reconstruction so that cone beam artifacts are not created in the final
images. And, iterative reconstruction techniques may also be applied.
A retrospective reconstruction, in which the reconstruction field of view is varied, uses:
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 biggdreamer. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $16.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
78998 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now