Mock 1.1

15 Questions

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Mock Test Quizzes & Trivia

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Questions and Answers
  • 1. 
    A pulse sequence is __________.
    • A. 

      A series of RF and/or gradient pulse

    • B. 

      Always on

    • C. 

      The scan time

    • D. 

      A radiofrequency

  • 2. 
    Image contrast is primarily controlled by manipulating the time between __________.
    • A. 

      Gradient pulses

    • B. 

      RF pulses

    • C. 

      RF and gradient pulses

    • D. 

      There is no contrast parameter in the pulse sequence

  • 3. 
    Tipping the NMV from a position along the Z axis, and into the transverse plane, is referred to as __________.
    • A. 

      Applying a 45° pulse

    • B. 

      Applying an inversion pulse

    • C. 

      Applying a 90° RF pulse

    • D. 

      Relaxation

  • 4. 
    There are two main types of pulse sequences: __________.
    • A. 

      Inversion recovery and echo planar

    • B. 

      Spin echo and gradient echo

    • C. 

      Fast spin echo and echo planar

    • D. 

      Diffusion and perfusion

  • 5. 
    Patients are placed in a strong magnetic field and proton spins align either with __________ or opposed __________ to the magnetic field
    • A. 

      (low energy) / (high energy state)

    • B. 

      (high energy state) / (low energy)

    • C. 

      Quantum energy / reserve energy

    • D. 

      Spin down / spin up

  • 6. 
    In order to double the flip angle, (a) __________ in RF power is required.
    • A. 

      No change

    • B. 

      10% increase

    • C. 

      2 fold increase

    • D. 

      Four-fold increase

  • 7. 
    As the NMV precesses through the xy plane, it will precess across a receiver coil oriented in the same plane. So in order to detect signal, __________.
    • A. 

      The NVM must be along the longitudinal axis and in phase (also known as "non zero")

    • B. 

      The NVM must be in the transverse plane and in phase (also known as "non zero")

    • C. 

      The NVM must be in the along the longitudinal axis and out of phase (also known as "zero")

    • D. 

      The NVM must be in the transverse plane and out of phase (also known as "zero")

  • 8. 
    In MRI, as the NMV __________ passes by a RF coil __________, an MR signal will be induced in the coil
    • A. 

      (a magnet) / (a conductive loop)

    • B. 

      (a conductive loop) / (a magnet)

    • C. 

      ( a resistive magnet) / (a superconductive loop)

    • D. 

      (a superconductive loop) / (a resistive magnet)

  • 9. 
    The signal induced in a receiver coil immediately following an RF excitation pulse is known as the __________.
    • A. 

      SAR or specific absorption rate

    • B. 

      FRE or flow related enhancement

    • C. 

      FID or Free Induction Decay

    • D. 

      MIP or maximum intensity pixel

  • 10. 
    After the RF pulse has been removed, the NMV shrinks because __________.
    • A. 

      Spins enter the high energy state

    • B. 

      Spins remain in the low energy state

    • C. 

      Spins maintain phase coherence

    • D. 

      Spins rapidly lose phase coherence

  • 11. 
    At the same time, but independently, some of the spins in the __________ state release the energy gained from the RF pulse and return to the __________ state.
    • A. 

      High energy / low energy

    • B. 

      Low energy / high energy

    • C. 

      High energy / high energy

    • D. 

      Low energy / low energy

  • 12. 
    A spin echo pulse sequence is acquired with the use of a __________ RF pulse.
    • A. 

      90° followed by a 90°

    • B. 

      180° followed by a 180°

    • C. 

      90° followed by a 180°

    • D. 

      45°

  • 13. 
    The FID signal decays as the result of __________.
    • A. 

      T1 recovery

    • B. 

      T2 decay

    • C. 

      Proton density

    • D. 

      T2* decay

  • 14. 
    In order to clean up the effects of inhomogeneities and susceptibility effects and evaluate T2 effects on MR images, __________ can be applied.
    • A. 

      A 180° refocusing pulse.

    • B. 

      A gradient pulse

    • C. 

      A 90° pulse

    • D. 

      Nothing

  • 15. 
    In spin echo imaging, the RF refocusing pulse rephases MR signal to create a __________.
    • A. 

      Inversion pulse

    • B. 

      Gradient echo

    • C. 

      Spin echo

    • D. 

      Dual echo