Magnetism in MRI

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Author:
hrmckensey1015
ID:
308573
Filename:
Magnetism in MRI
Updated:
2015-09-26 14:52:55
Tags:
magnetism mr
Folders:
MRI
Description:
magnetism in MRI
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  1. What is magnetic inhomogeneity expressed in?
    Parts per million (ppm)
  2. How many Gauss are in 1 T?
    10,000 G
  3. What does Faraday's Law of induction state?
    A changing magnetic field will induce a voltage
  4. What are the most commonly used systems?
    Superconducting magnet systems
  5. Ferromagnetic means
    iron and iron like substances that can generate a relatively strong magnetic field
  6. Paramagnetic means
    Have a very weak magnetic field
  7. Gadolinium is considered to be ______
    Paramagnetic
  8. Diamagnetic means
    Have no magnetic field
  9. What are examples of ferromagnetic substances?
    Stainless steel, Iron, Nickel
  10. What is magnetic susceptibility?
    the extent to which a material or tissue becomes magnetized in an external magnetic field
  11. What is magnetic permeability?
    How well a material attracts the imaginary lines of the magnetic field
  12. What is accomplished with iron shielding?
    The magnetic field will not extend out into the adjacent rooms
  13. Protons that are parallel to magnetic field are _____ energy
    low
  14. Protons that align anti-parallel to the magnetic field are _____energy
    high
  15. Hydrogen protons that are spin down are ____
    energy
    high
  16. What is the Net Magnetization Vector?
    The excess number of hydrogen protons aligned with the static magnetic field
  17. A Free induction decay (FID) is produced from a  ______
    RF pulse
  18. During one T1 relaxation time how much longitudinal magnetization is recovered?
    63%
  19. What is T2 relaxation time?
    the time it takes for 63% of the Transverse magnetization to decay
  20. T2 relaxation is also called
    Spin spin relaxation
  21. What component provides the ability to perform spatial encoding?
    Gradient system

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