CT Registry Review Hh

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CT Registry Quizzes & Trivia

The ct registry review program


Questions and Answers
  • 1. 
    On a multi-row detector scanner, radiation penumbra may be found:
    • A. 

      On every other slice

    • B. 

      Only on the trailing edges of the slices

    • C. 

      On every slice

    • D. 

      Only on the first and last slices of the slice volume

  • 2. 
    What is normal blood presure values for adult systolic
    • A. 

      90-140

    • B. 

      75-90

    • C. 

      80-110

    • D. 

      70-100

    • E. 

      60-90

  • 3. 
    What is the normal blood presure values for adults diastolic
    • A. 

      60-90

    • B. 

      70-85

    • C. 

      85-100

    • D. 

      75-90

    • E. 

      50-75

  • 4. 
    The average adult pulse rate rages
    • A. 

      50-85

    • B. 

      65-95

    • C. 

      65-100

    • D. 

      80-110

    • E. 

      70-100

  • 5. 
    The average pulse rate for an infant ranges
    • A. 

      90-100

    • B. 

      45-95

    • C. 

      100-180

    • D. 

      110-120

    • E. 

      120-200

  • 6. 
    On a single -row detector scanner, which of the following does not decrease the pt dose
    • A. 

      Decreasing the scan time while leaving the mA constant

    • B. 

      Decreasing the slice thickness while covering the same anatomical region

    • C. 

      Reformat the data instead of rescanning

    • D. 

      Increasing the pitch

  • 7. 
    Blood urea nitrogen level of ---mg/dl is considered outside the normal range
    • A. 

      10

    • B. 

      18

    • C. 

      32

  • 8. 
    If there is no overlap or gabetween adjacent slices of a ct scan, CTDI-----MSAD
    • A. 

      IS LESS THAN

    • B. 

      EQUALS

    • C. 

      IS MUCH GREATER THAN

    • D. 

      IS SLIGHTLY GREATER THAN

  • 9. 
    WHICH OF THE FOLLOWING REDUCES PATIENT DOSE AT THE EXPENSE OF INCREASING TTHE APPARENT NOISE IN THE IMAGE
    • A. 

      KVP

    • B. 

      PITCH

    • C. 

      TABLE INCREMENT

    • D. 

      MAS

  • 10. 
    ------------------scanner design was the first to acquire four slices in a single rotation
    • A. 

      Second-generation

    • B. 

      Third generation

    • C. 

      Multi-row detector

    • D. 

      Continuous rotation

  • 11. 
    Which of the following is a component not normally located in the gantry of a modern ct system
    • A. 

      Pre-patient collimator

    • B. 

      Solid-state detectors

    • C. 

      Array processor

    • D. 

      X-ray tube

  • 12. 
    Bremsstrahlung radiation does not include which type of electron activity
    • A. 

      Collision btw an incoming electron and the nucleus of the target atom

    • B. 

      Collision btw an incoming electron and an electron in an inner shell of the target atom

    • C. 

      Slowing down of an incoming electron due to the effect of passing close to the positive charge of the nucleus of the target atom

  • 13. 
    Which of the following statement is FALSE regarding occurrences after an x-ray photon penetrates the detector aperture
    • A. 

      The photon can pass through the detector unmeasured

    • B. 

      The photon is conveted completely into an electron

    • C. 

      The measured signal is enhanced by an emplifier

  • 14. 
    Ct images can be directly scanned in planes other than transverse by
    • A. 

      Orienting the pt body part so that it is not perpendicular to the xpray beam

    • B. 

      Tilting the gantry

    • C. 

      Changing the angle that the x-ray beam leaves the tube

  • 15. 
    Which of the following is false about the spatial resoultion of an image?
    • A. 

      Resolution is dependent on matrix size

    • B. 

      Resolution is dependent on reconstruction FOV

    • C. 

      Resolution is dependent on scanned FOV

  • 16. 
    If the slice thickness is changed from 5mm to 7mm and all other parameters are held constant,-----% more photons will be used inmaking the slice
    • A. 

      30

    • B. 

      40

    • C. 

      60

    • D. 

      60

    • E. 

      80

  • 17. 
    If a reconstruction FOV of 32 cm and a 512 x 512 matrix are used, the pixel size is ----mm
    • A. 

      0.35

    • B. 

      0.625

    • C. 

      1.6

    • D. 

      3.25

  • 18. 
    Which of the following does not occure when reconstruction FOV is decreased
    • A. 

      Spatial resolution is increased

    • B. 

      Pixel size is increased

    • C. 

      Noise in the image increases

  • 19. 
    The smalles object that can be resolved if a reconstruction FOV of 24 cm and a 512 x 512 matrix are used is ------mm
    • A. 

      0.47

    • B. 

      1.00

    • C. 

      2.13

    • D. 

      3.57

  • 20. 
    If the radiologist requires 2mm thick contiguous slices through the pituitary, and 2.4 cm of coverage,----slices are necessary?
    • A. 

      8

    • B. 

      10

    • C. 

      12

    • D. 

      13

  • 21. 
    Which of the following is not a result of reducing the reconstruction FOV?
    • A. 

      Improved spatial resolution

    • B. 

      Increased appearance of image noise

    • C. 

      Anatomical structures appear smaller

  • 22. 
    150mm FOV a wecond 300mm FOV which of the following statements is false
    • A. 

      The second set resoulution is better than the first set

    • B. 

      Noise in the second set more pronounced than first set

    • C. 

      Pt dose of the first set higher than the second set

  • 23. 
    Which of the following parameters causes helical slices to be reconstructed so they overlap
    • A. 

      Table increment

    • B. 

      Reconstruction interval

    • C. 

      Pitch

    • D. 

      Collimation

  • 24. 
    Which of the following can be changed retrospectively?
    • A. 

      Slice thickness from an MDCT helical scan

    • B. 

      The slice overlap from a single row detector scanner helical scan

    • C. 

      The slice thickness from a single-row detector scanner helical scan

  • 25. 
    Which of the following values for pitch would stretch the x-ray helix the most?
    • A. 

      1.0

    • B. 

      1.5

    • C. 

      0.5

    • D. 

      0.8

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