Exam (elaborations)
CT TEST QUESTIONS WITH VERIFIED ANSWERS
- Course
- Institution
CT TEST QUESTIONS WITH VERIFIED ANSWERS
[Show more]
Content preview
CT TEST QUESTIONS WITH VERIFIEDANSWERS
What is the unit of measurement for current of electrons that flow from the filament to
the anode? - Answer-mA
Which is not a scanning parameter?
Slice thickness
Patient size
Field of view
Reconstruction algorithm - Answer-Patient size
What is the kVp range for routine body CT for adult patients? - Answer-120kvp-140kvp
Is it more common to manipulate the Kvp or the mAs for radiation dose? - Answer-The
mAs
What percent reduction in radiation dose do automatic tube current modulations provide
without degrading image quality? - Answer-15% to 40%
What factors are controlled by the CT tech? - Answer-mA , scan time, slice thickness,
field of view, reconstruction algorithm and kVp
Even when the mAs or kVp setting is too high, a good image still results. What effect is
this? - Answer-The uncoupling effect
How is the tube current predefined? - Answer-By taking an AP and lateral localizer
scans. Some adjust in real time
What is the relationship between slice thickness and table travel per rotation - Answer-
Pitch
The travel distance of the CT scan table per 360° rotation of the x-ray tube, divided by
the x-ray beam collimation width is called ________ - Answer-Pitch
_________ resolution is another term used for detail resolution. - Answer-Spatial
How man degrees is a full scan - Answer-360
How many degrees is a partial scan or half scans - Answer-180 plus the degree of arc
of the fan angle
, What is the typical range of values for scan time for a full rotation of the tube and
detector array within the gantry during helical scanning? - Answer-0.5 to 2 seconds
How many degrees is a overscan? - Answer-400 (full scan plus field of view, usually 40
degrees)
What is not considered a scanning parameter? - Answer-Patient size
Whats the advantage of overscans - Answer-Reduced motion artifacts
Which is not another name for reconstruction algorithm?
convolution filter
FC filter
spatial frequency algorithm
algorithm - Answer-spatial frequency algorithm
Which is not a factor that affects contrast resolution?
Slice thickness
Patient size
Reconstruction algorithm
CTDI phantoms - Answer-CTDI phantoms
What does high Ma achieve, lower or higher scan times? - Answer-Lower scan times
What is an alternate term for image accuracy? - Answer-Image fidelity
What is the ability of the system to differentiate between objects with similar densities. -
Answer-Low contrast resolution
What is the level of detail on the image - Answer-High contrast resolution
The systems ability to resolve as separate forms, small objects that are very close
together. - Answer-spatial resolution
If 20 lines an be seen in a 1cm section in an image of the phantom, the spatial
resolution is reported as what? - Answer-20 lines pairs per centimeter
What is used as a direct method of measuring spatial resolution? - Answer-Lines pair
phantom
What is the number of line pairs visible per unit length - Answer-Spatial frequency
What is a ratio that determines the accuracy of the image compared with the actual
object being scanned. It also indicates image fidelity. - Answer-MTF or Modulation
Transfer Function
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 $14.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
72042 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now