CT StudyGuidelines 3

135 Responses | Created by jcsmith22 |
  1. 1

    Which of the following parameters is responsible for partial volume averaging?

  2. 2

    Which of the following can be changed retrospectively?

  3. 3

    Which of the following does NOT occur when reconstruction FOV is decreased?

  4. 4

    Which of the following will result in an increased voxel size?

  5. 5

    Which of the following occurs when slice thickness is reduced?

  6. 6

    Which of the following is NOT directly proportional to mAs?

  7. 7

    The _________ determines how penetrating the xray beam will be.

  8. 8

    Which of the following parameters allows adjacent slices to be overlapped without increasing the dose to the patient?

  9. 9

    If a thin slice is used, which of the followin would help reduce the apparent image noise?

  10. 10

    If a reconstruction FOV of 32 cm and a 512 X 512 matrix are used, the pixel size is _______mm.

  11. 11

    Which of the following values for pitch would stretch the xray helix the most?

  12. 12

    The distance that the table travels between slices is called:

  13. 13

    Which of the following is the expected result of a CT number calibration test preformed on a water phantom?

  14. 14

    Which of the following are possible results of partial voluming?

  15. 15

    ___________ affects ths CT number of water

  16. 16

    Which of the following is a reason to increase the pitch?

  17. 17

    Which of the following determinants of CT image quality is responsible for how grainy or speckled a CT image appears?

  18. 18

    CT numbers ________ would appear black if a window width of 400 and a window level of -100 are used.

  19. 19

    A CT number calibration test should be performed:

  20. 20

    If the slice thickness is changed from 5mm to 7mm and all other parameters are held constant,____% more photons will be used in making the slice

  21. 21

    Which of the following is FALSE about the spatial resolution of an image?

  22. 22

    Which of the following parameters affects the contrast of a CT image?

  23. 23

    ________ the window _______ will make the image appear darker so that bony structures can be evaluated.

  24. 24

    Which of the following is NOT a result of reducing the reconstruction FOV?

  25. 25

    For a given distance of coverage, which of the following is TRUE?

  26. 26

    Which of the following is the conversion equation from CT number to Hounsfield unit?

  27. 27

    Which of the following would be used in a high resolution study of the temporal bones?

  28. 28

    Which of the following parameters causes helical slices to be reconstructed so they overlap?

  29. 29

    On MDCT, the final reconstructed slice thickness is determined by the:

  30. 30

    Which of the following has the highest patient dose assuming all other parameters are the same?

  31. 31

    Increasing ________ results in lowering the patient dose.

  32. 32

    If a calcification with a CT number of +300 appears pure white on an image, which of the following could be the window width and window level selected?

  33. 33

    Which of the following would be used to better visualize low contrast resolution?

  34. 34

    There are _______ total pixels in a 1024 x 1024 matrix

  35. 35

    An increase in _______ will result in hardening of an xray beam.

  36. 36

    If the radiologist requires 2 mm thick contiguous slices through the pituitary, and 2.4 cm of coverage, ___ slices are nessary?

  37. 37

    On a conventional, or serial CT scan, if we want 5mm slices with 1mm of overlap, the table increment should be ____mm.

  38. 38

    Which of the following statements is FALSE?

  39. 39

    The smallest object that can be resolved if a recontruction FOV of 24 cm and a 512 x 512 matrix are used is ______ mm.

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