CT Simulated Exam Images 4

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Author:
sully79
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308202
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CT Simulated Exam Images 4
Updated:
2015-09-20 22:54:16
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CT Registry Review
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CT Registry Review Images
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  1. 92. Number 3 on the figure corresponds to which of the following?
    A. left posterior cerebral artery
    B. left anterior cerebral artery
    C. left posterior communicating artery
    D. left middle cerebral artery
    A. left posterior cerebral artery
    (this multiple choice question has been scrambled)

  2. 96. Number 2 on the figure corresponds to which of the following?
    A. right brachiocephalic vein
    B. left subclavian artery
    C. left brachiocephalic vein
    D. brachiocephalic artery
    B. left subclavian artery
    (this multiple choice question has been scrambled)

  3. 97. Number 5 on the figure corresponds to which of the following?
    A. brachiocephalic artery
    B. left brachiocephalic vein
    C. right brachiocephalic vein
    D. left subclavian artery
    C. right brachiocephalic vein
    (this multiple choice question has been scrambled)

  4. 98. Number 1 on the figure corresponds to which of the following?
    A. right brachiocephalic vein
    B. left subclavian artery
    C. left brachiocephalic vein
    D. brachiocephalic artery
    C. left brachiocephalic vein
    (this multiple choice question has been scrambled)

  5. 99. Which number on the figure corresponds to the left common carotid artery?
    A. 4
    B. 1
    C. 6
    D. 3
    A. 4
    (this multiple choice question has been scrambled)

  6. 104. Which number on the figure corresponds to the superior mesenteric vein?
    A. 5
    B. 2
    C. 3
    D. 1
    D. 1
    (this multiple choice question has been scrambled)

  7. 105. Number 4 on the figure corresponds to which of the following?
    A. adrenal gland
    B. descending colon
    C. spleen
    D. renal vein
    C. spleen
    (this multiple choice question has been scrambled)

  8. 106. Number 6 on the figure corresponds to which of the following?
    A. pancreas
    B. appendix
    C. duodenum
    D. terminal ileum
    A. pancreas
    (this multiple choice question has been scrambled)

  9. 118. Which of the following artifacts is evident on the image in the figure?
    A. aliasing
    B. blooming
    C. ring artifact
    D. edge gradient effect
    D. edge gradient effect

    The edge gradient effect ocurs when the CT x-ray beam passes through areas of abrupt changes in density that are represented by high spatial frequencies. This type of streak artifact commonly occurs at the interface of dense bone and soft tissue in anatomic areas such as the brain.
    (this multiple choice question has been scrambled)

  10. 119. Which of the following would serve to reduce the image artifact present in the figure?
    1. increase in filtration
    2. increase in kVp
    3. increase in section width
    A. 1 only
    B. 1 and 3 only
    C. 1 and 2 only
    D. 1, 2, and 3
    C. 1 and 2 only

    Streaking edge gradient artifacts may be reduced with increases in the beam's average photon energy. Increases in kVp and filtration would accomplish this. This type of artifact may also be reduced with a decrease in reconstructed section width, which helps minimize the edge gradient effect. A decrease in partial volume averaging may lessen the streaking that is apparent from edge gradient inconsistencies.
    (this multiple choice question has been scrambled)

  11. 120. The image in the figure was most likely displayed in a window with a level of:
    A. +400
    B. 0
    C. -150
    D. +50
    D. +50

    The level chosen for a given window setting should correspond to the average density value of the tissue(s) of interest. Areas of soft tissue, such as brain, are often displayed at window levels of approximately +50 HU.
    (this multiple choice question has been scrambled)

  12. 134. The circle shown on the image in the figure is used to:
    A. localize an area for percutaneous biopsy
    B. magnify a portion of the image
    C. perform an ROI measurement
    D. produce an MPR image
    C. perform an ROI measurement

    Region of interest (ROI) measurements may be made by superimposing a cursor over an area and instructing the computer to average the CT numbers included within the region.
    (this multiple choice question has been scrambled)

  13. 135. The density measurement performed in the figure yielded an average CT number of zero. This area consists of:
    A. fat
    B. water
    C. blood
    D. air
    B. water
    (this multiple choice question has been scrambled)

  14. 157. The limiting resolution of the bone algorithm in the figure is:
    A. 15.5 lp/cm
    B. 14.6 lp/cm
    C. 6.1 lp/cm
    D. 9.5 lp/cm
    B. 14.6 lp/cm

    The limiting resolution of a particular CT scan is determined at a point on the graph where the signal frequency corresponding to a particular object has reached 10% (MTF=0.1).
    (this multiple choice question has been scrambled)

  15. 158. At an MTF of 20%, which reconstruction algorithm will demonstrate the greatest number of line pairs per centimeter (lp/cm)?
    A. impossible to determine from the information provided
    B. standard
    C. smooth
    D. bone
    D. bone

    According to the MTF diagram, the bone algorithm has a resolution of approximately 12 lp/cm. The standard algorithm and smooth algorithm are approximately 10 and 7 lp/cm respectively.
    (this multiple choice question has been scrambled)

  16. 159. When one is assessing an MTF graph such as the figure, the limiting resolution is determined at a point where the signal frequency corresponding to a particular object has reached:
    A. 100%
    B. 20%
    C. 50%
    D. 10%
    D. 10%

    The limiting resolution of a particular CT scan is determined at a point on the graph where the signal frequency corresponding to a particular object has reached 10%. When the MTF is lower than 10% (0.1), the object is no longer resolved.
    (this multiple choice question has been scrambled)

  17. 32. NumberĀ 4 in the figure corresponds to which of the following?
    A. left adrenal gland
    B. large colon
    C. spleen
    D. duodenum
    B. large colon

    large colon (splenic flexure)
    (this multiple choice question has been scrambled)

  18. 33. Number 2 in the figure corresponds to which of the following?
    A. portal vein
    B. superior mesenteric vein
    C. common bile duct
    D. inferior vena cava
    A. portal vein
    (this multiple choice question has been scrambled)

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