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Pretest Questions

  1. The gantry is best describes as:
    the mechanism that houses the scanning equipment.
  2. Calibration is the process by which:
    the scanning equipment is tested and reset to recognize scanning parameters accurately.
  3. The DAS is responsible for:
    accumulating, amplifying, sampling, and converting the electronic signal produced by CT scanning for processing into an image.
  4. Which of the following statements is NOT true regarding slice thickness?




    B) thicker slices increase resolution and scanning time
  5. mAs refer to:
    a CT parameter defined as time current multiplied by the scanning time.
  6. A photomultiplier tube is used to:
    amplify light signals produced by a scintillation detector.
  7. The main purpose of slip ring technology is to:
    allow for the continuous rotation of the detectors and X-ray tube around the patient.
  8. Which of the following is NOT a permanent storage device?



    B) RAM
  9. The main difference between a second-gen and third gen scanner is:
    the third gen scanner introduced the capacity for continuous rotation scanning.
  10. A kernel is the same thing as a:
    voxel
  11. A pixel may be defines as:
    the two-dimensional square that represents the smallest unit of information conveyed in an image grid.
  12. What is the range of pixel values used in CT scanning?
    -1000 to +1000 or greater
  13. The detectors in a scanner measure what kind of energy?
    the x-rays that are attenuated by the passing through the patient's body.
  14. Multiplanar reconstructions are applied to which of the following:
    image data
  15. Which of the following does not move during a spiral/helical CT scan on a third-generational scanner?
    the analog-to-digital converter (ADC)
  16. Which of the following CT components is the most frequently replaced?
    the X-ray tube
  17. A benefit to using a gas-filled detector rather than a solid state detector is:
    elimination of the afterglow effect.
  18. A projection is the same as:
    raw data.
  19. The CT components that shape the x-ray beam are called:
    collimators
  20. The edge gradient effect refers to:
    a streaking effect produced by objects of irregular shape and similar density to other objects around them.
  21. Decreasing display field of view (DFOV) will result in which of the following?
    increased resolution and noise.
  22. The CT number of water:
    should always be near 0.
  23. An aliasing artifact is one that:
    resulting from improper sampling of the object tissue.
  24. Motion artifacts are most likely to be cause by:
    involuntary or voluntary movements by the patient.
  25. Which of the following does NOT affect image quality?




    C) filtering
Author
kaeten10
ID
341199
Card Set
Pretest Questions
Description
Basic Principles and Image formation
Updated

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