MRI Angio Principles Quiz
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Questions and Answers

What is the basic principle of Time of Flight (TOF) MRA?

  • It manipulates the phase of the magnetization to derive contrast between flowing blood and stationary tissues
  • It uses contrast media to visualize blood
  • It repeats the RF pulses to the longitudinal spins, causing loss of signal in the longitudinal spins
  • It is based on flow-related enhancement with high signal for inflow and low signal for outflow (correct)

    • What is the purpose of pre-saturating bands in TOF MRA?

  • To derive contrast between flowing blood and stationary tissues
  • To visualize blood using contrast media
  • To repeat the RF pulses to the longitudinal spins
  • To reduce unwanted signal from blood flowing into the imaging field from a certain direction (correct)

    • What is the distinguishing feature of Phase Contrast MRA (PC MRA) compared to TOF MRA?

  • It repeats the RF pulses to the longitudinal spins, causing loss of signal in the longitudinal spins
  • It uses contrast media to visualize blood
  • It can quantify velocity and direction of blood flow (correct)
  • It is based on flow-related enhancement with high signal for inflow and low signal for outflow

    • What is the effect of bipolar gradients in PC MRA?

    <p>They are used to encode phase information with equal magnitude but opposite sign</p> Signup and view all the answers

    What is the purpose of short TR in TOF MRA?

    <p>To prevent longitudinal recovery in the imaging plane and make stationary tissue appear dark</p> Signup and view all the answers

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