Magnetic Resonance Imaging (MRI) System Components
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Questions and Answers

What is the function of the Main magnet in an MRI system?

  • To produce gradient magnetic field
  • To generate static magnetic field (correct)
  • To slide the patient into the MRI machine
  • To produce radiofrequency waves

    • Why is the Radio-frequency (RF) coil important in an MRI system?

  • To produce radiofrequency waves that penetrate the body (correct)
  • To slide the patient into the MRI machine
  • To produce gradient magnetic field
  • To generate static magnetic field

    • What is the role of the Computer system in an MRI setup?

  • To generate static magnetic field
  • To detect RF signals emitted by the patient's body and feed this information into the computer system (correct)
  • To produce radiofrequency waves
  • To slide the patient into the MRI machine

    • Why do static magnetic fields used in MRIs have a frequency of 0 Hz?

    <p>To indicate direction changes over time</p> Signup and view all the answers

    What is the main difference between Earth's magnetic field and an MRI magnet's field?

    <p>Earth's magnetic field is weaker than the MRI magnet's field.</p> Signup and view all the answers

    Why should pregnant patients not be exposed to an MRI machine > 2.5 T?

    <p>High-intensity fields can affect fetal development.</p> Signup and view all the answers

    What is the function of the gradient magnetic field in an MRI machine?

    <p>To produce different intensities for imaging purposes.</p> Signup and view all the answers

    What distinguishes a superconductive magnet from a permanent magnet in an MRI machine?

    <p>Superconductive magnets do not require cryogen.</p> Signup and view all the answers

    Why have permanent magnets with a horizontal field been considered innovative?

    <p>They allow patients to be positioned upright during scanning.</p> Signup and view all the answers

    Which disadvantage is associated with permanent magnets in MRI machines?

    <p>Large fringe field</p> Signup and view all the answers

    What is a significant advantage of resistive electromagnets compared to other types of electromagnets?

    <p>Low capital costs</p> Signup and view all the answers

    Why are resistive electromagnets preferred when capital costs are a major concern?

    <p>Low capital costs</p> Signup and view all the answers

    What is a key disadvantage of resistive electromagnets that limits their application in some contexts?

    <p>High power consumption</p> Signup and view all the answers

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