CT Registry Review Program Post-Test Questions and Answers Graded A+
5 views 0 purchase
Course
CT Registry
Institution
CT Registry
CT Registry Review Program Post-Test Questions and Answers Graded A+
Bremsstrahlung radiation does NOT include which type of electron activity?
1. Collision between an incoming electron and the nucleus of the target atom
2. Collision between an incoming electron and an electron in an inner shell...
CT Registry Review Program Post-Test
Questions and Answers Graded A+
Bremsstrahlung radiation does NOT include which type of electron activity?
1. Collision between an incoming electron and the nucleus of the target atom
2. Collision between an incoming electron and an electron in an inner shell of the target
atom
3. Slowing down of an incoming electron due to the effect of passing close to the
positive charge of the nucleus of the target atom - answer2 only. Collision between an
incoming electron and an electron in an inner shell of the target atom describes
characteristic radiation.
Collimation is accomplished by: - answer Physically blocking x-rays
Which of the following statements is FALSE regarding occurrences after an x-ray
photon penetrates the detector aperture?
1. The photon can pass through the detector unmeasured
2. The photon is converted completely into an electron
3. The measured signal is enhanced by an amplifier - answer2 only
Which of the following utilizes convolution?
1. 3D SSD
2. Fourier Transform
3. Filtered back projection - answer3 only. Filtered back projection
In which technique are tissues other than the surface of a structure excluded by setting
a threshold value and eliminating pixels above or below that threshold?
a. volume rendering
b. multi-planar reconstruction
c. maximum intensity projection
d. 3D shaded surface display - answerD. 3D shaded surface display
Which of the following statements is TRUE?
1. The amplified electrical signal obtained from the detectors must be digitized
2. Digital CT images are numerical representations of cross-sectional anatomy
3. Digital signals may be formed by sampling analog signals at discrete time intervals -
answer1, 2 & 3
A single 2D picture element within the image plane - answerPixel
, The pencil thin section of the x-ray fan beam that strikes a single detector is called a: -
answerRay
Determines the intensity of the laser beam in a laser camera - answerPixel values in the
image data
Allows helical data to be converted into planar raw data - answerInterpolation
The most common type of film used for recording CT images - answerSingle emulsion
MDCT scanners capable of collecting 64 slices in a single rotation do NOT: -
answerUse filtered back projection as their method of image reconstruction.
What benefits does the dual focal spot provide compared to a single focal spot? -
answerThe number of projections is doubled.
CT numbers ______ would appear black if a window width of 400 and a window level of
-100 are used.
a. above +200
b. below -300
c. below -200
d. above +100 - answerB. below -300
Which of the following is FALSE about the spatial resolution of an image?
1. resolution is dependent on matrix size
2. resolution is dependent on reconstruction FOV
3. resolution is dependent on scanned FOV - answer3 only
An increase in _____ will result in hardening of an x-ray beam.
1. tissue density
2. tissue thickness
3. kVp - answer1, 2 & 3
Which of the following will result in an increased voxel size?
1. decreased reconstruction FOV
2. increased slice thickness
3. increased matrix - answer2. Increased slice thickness.
Which of the following does NOT occur when reconstruction FOV is decreased?
1. spatial resolution is increased
2. pixel size is increased
3. noise in the image increases - answer2 only
Which of the following occurs when slice thickness is reduced?
1. appearance of noise in the image increases
2. the number of photons used in making the slice decreases
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 julianah420. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $13.99. You're not tied to anything after your purchase.
