Mock 2.9

21 Questions

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Mock Test Quizzes & Trivia

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Questions and Answers
  • 1. 
    A voxel that is isotropic is __________ in __________ dimensions and shaped like a __________.
    • A. 

      Equal / all / cube

    • B. 

      Equal / two / parallelogram

    • C. 

      Equal / two / rectangle

    • D. 

      Unequal / all / hexagram

  • 2. 
    Reducing the receiver bandwidth, __________ the signal-to-noise ratio (SNR).
    • A. 

      Increases

    • B. 

      Decreases

    • C. 

      Does not effect

    • D. 

      Doubles

  • 3. 
    Narrowing the receiver bandwidth, __________ the minimum allowable TE.
    • A. 

      Increases

    • B. 

      Decreases

    • C. 

      Does not effect

    • D. 

      Doubles

  • 4. 
    As the bandwidth is reduced and sampling time is __________, gradient amplitude or slope is __________.
    • A. 

      Increased / reduced

    • B. 

      Reduced / reduced

    • C. 

      Increased / increased

    • D. 

      Reduced / Increased

  • 5. 
    Narrowing the receiver bandwidth, __________ the chemical shift artifact.
    • A. 

      Increases

    • B. 

      Decreases

    • C. 

      Does not effect

    • D. 

      Doubles

  • 6. 
    When acquiring axial images of the neck and hypointense signal in blood vessels is desired, presaturation pulses can be prescribed __________ to the slices
    • A. 

      Superior

    • B. 

      Inferior

    • C. 

      Superior and inferior

    • D. 

      Anterior

  • 7. 
    STIR sequences with a TI time of 150 ms, suppress __________ based on the T1 recovery time.
    • A. 

      Fat

    • B. 

      Water

    • C. 

      Liver

    • D. 

      Silicone

  • 8. 
    Fat saturation is a __________ suppression technique.
    • A. 

      Chemical shift selective

    • B. 

      Spectral

    • C. 

      Spatial

    • D. 

      A &

  • 9. 
    First-order GMN corrects only for __________.
    • A. 

      Constant velocity

    • B. 

      Accelerated flow

    • C. 

      Pulsitile flow

    • D. 

      C & b

  • 10. 
    If the patient has a heart rate of 60 beats per minute, the scan would be triggered 60 times per minute or every __________. The effective TR would therefore be __________.
    • A. 

      1 second / 1000 msec

    • B. 

      1 minute / 1000 msec

    • C. 

      1 minute / 100 msec

    • D. 

      B & c

  • 11. 
    Calculate the available imaging time for the following cardiac gated acquisition, if the heart-rate is 60 BPM and the trigger delay is 50 ms and the trigger window is 10%
    • A. 

      1000 ms

    • B. 

      800 ms

    • C. 

      100 ms

    • D. 

      850 ms

  • 12. 
    Calculate the possible cardiac phases that could be acquired in the cine acquisition, if the heart-rate is 60 BPM and the TR is 25 ms.
    • A. 

      1500 phases

    • B. 

      150 phases

    • C. 

      40 phases

    • D. 

      25 phases

  • 13. 
    __________ is an example of a sampling artifact and occurs in both the phase and frequency directions where signal from outside the FOV is superimposed in the FOV.
    • A. 

      "fold-over"

    • B. 

      "wrap-around"

    • C. 

      "aliasing"

    • D. 

      All of the above

  • 14. 
    A "leak" in the RF shielding can result in extraneous signals entering the scan room and manifesting themselves as __________ on images.
    • A. 

      "fold-over"

    • B. 

      "zipper artifact"

    • C. 

      "chemical shift"

    • D. 

      Herringbone

  • 15. 
    Examples of reconstruction artifacts include the so-called __________ artifacts.
    • A. 

      "fold-over"

    • B. 

      "zipper artifact"

    • C. 

      "chemical shift"

    • D. 

      Herringbone

  • 16. 
    Hydrogen in fat and hydrogen in water precess at different frequencies, this shift in resonant frequency is referred to as __________.
    • A. 

      "fold-over"

    • B. 

      "zipper artifact"

    • C. 

      "chemical shift"

    • D. 

      Herringbone

  • 17. 
    Truncation and Gibbs artifact appear as striations or "lines" in the __________ direction.
    • A. 

      Phase

    • B. 

      Frequency

    • C. 

      Right

    • D. 

      K-space

  • 18. 
    Truncation and Gibbs artifact can be minimized by __________ encoding steps.
    • A. 

      Increasing the phase

    • B. 

      Increasing the frequency

    • C. 

      Increasing the right

    • D. 

      Increasing the k-space

  • 19. 
    Magnetic susceptibility artifact appears as a __________ in the area of the metal.
    • A. 

      "signal void"

    • B. 

      "zipper artifact"

    • C. 

      "herringbone"

    • D. 

      "corduroy"

  • 20. 
    Magnetic susceptibility artifact is proportional to __________.
    • A. 

      Field strength, voxel volume, and TE

    • B. 

      Size of metal and type of metal

    • C. 

      Type of imaging sequence

    • D. 

      All of the above

  • 21. 
    Partial volume averaging is the result of large voxel imaging acquired with __________.
    • A. 

      Large FOV

    • B. 

      Thick slices

    • C. 

      Small matrix

    • D. 

      All of the above