Mock 2.5

15 Questions

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Information Quizzes & Trivia

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Questions and Answers
  • 1. 
    For T1 information in the brain at lower field strengths, 0.2 T-0.5 T, lower TR times __________ are usually desired.
    • A. 

      250 msec-400 msec

    • B. 

      400 msec-500 msec

    • C. 

      1000 msec-15000 msec

    • D. 

      2000 msec-4000 msec

  • 2. 
    As TE is reduced, the image reflects __________.
    • A. 

      More T1 contrast

    • B. 

      Less T1 contrast

    • C. 

      More T2 contrast

    • D. 

      Less T2 contrast

  • 3. 
    Selecting a long TE (80 msec or higher) will then produce an image with __________.
    • A. 

      More T1 contrast

    • B. 

      Less T1 contrast

    • C. 

      More T2 contrast

    • D. 

      Less T2 contrast

  • 4. 
    Using a long TR does not make an image __________, it makes it less __________.
    • A. 

      T2 weighted / T2 weighted

    • B. 

      T2 weighted / T1 weighted

    • C. 

      T1 weighted / T1 weighted

    • D. 

      T1 weighted / T2 weighted

  • 5. 
    If proton density (PD) weighting is desired, a short TE is selected (20 msec or less) to reduce the __________ and a long TR is then selected (2000 msec or higher) to reduce __________.
    • A. 

      T2 weighting / T2 weighting

    • B. 

      T2 weighting / T1 weighting

    • C. 

      T1 weighting / T1 weighting

    • D. 

      T1 weighting / T2 weighting

  • 6. 
    Reducing the TR increases the __________ on the image.
    • A. 

      T1 weighting

    • B. 

      T2 weighting

    • C. 

      PD weighting

    • D. 

      None of the above

  • 7. 
    As we increase TR, scan time __________.
    • A. 

      Increases

    • B. 

      Decreases

    • C. 

      Reduces by half

    • D. 

      Stays the same

  • 8. 
    As TR increases, the available imaging time (within the sequence) __________ and therefore, the number of slices allowed during the sequence __________.
    • A. 

      Increases / increases

    • B. 

      Increases / decreases

    • C. 

      Decreases / decreases

    • D. 

      Decreases / increases

  • 9. 
    Reducing the TR will increase the saturation of tissues and therefore will result in (a/an) __________ in the SNR.
    • A. 

      Increase

    • B. 

      Decrease

    • C. 

      Variation

    • D. 

      Stability

  • 10. 
    TE is the time __________.
    • A. 

      Between the initial RF excitation pulse and the echo

    • B. 

      Between 90' RF pulses

    • C. 

      Between the initializing 180' RF pulse and the 90' pulse

    • D. 

      Time between the 90' pulse and the 180' pulse

  • 11. 
    Increasing the TE increases the __________ on the image.
    • A. 

      T1 weighting

    • B. 

      T2 weighting

    • C. 

      PD weighting

    • D. 

      None of the above

  • 12. 
    Longer TE allows for __________ slices.
    • A. 

      More

    • B. 

      Less

    • C. 

      No change

    • D. 

      None of the above

  • 13. 
    Increasing the TE increases the amount of transverse magnetization decay between the excitation pulse and the sampling of the echo and therefore will result in (a/an) __________ in SNR.
    • A. 

      Increase

    • B. 

      Doubling

    • C. 

      Reduction

    • D. 

      No change

  • 14. 
    The increase in TE, and resultant increase in dephasing results in (a/an) __________ in susceptibility artifact, especially on gradient echo images.
    • A. 

      Increase

    • B. 

      Doubling

    • C. 

      Reduction

    • D. 

      No change

  • 15. 
    At 1.5T images are out of phase at __________ TE and in phase at roughly __________ TE.
    • A. 

      2.2 ms / 2.2 ms

    • B. 

      4.4 ms / 4.4 ms

    • C. 

      2.2 ms / 4.4 ms

    • D. 

      4.4 ms / 2.2 ms