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ANIMATIONS for MRI

ANIMATIONS for MRI. Animations for NMR/MRI Animations in Mathematica by Matson. Classical Precession of Nuclear Spin. Precession of nuclear spin about the applied field along the Z axis Classical mechanics picture. Classical Precession of Nuclear Spin.

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ANIMATIONS for MRI

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  1. ANIMATIONS for MRI Animations for NMR/MRI Animations in Mathematica by Matson

  2. Classical Precession of Nuclear Spin • Precession of nuclear spin about the applied field along the Z axis • Classical mechanics picture

  3. Classical Precession of Nuclear Spin • Classical picture of nuclear precession: • System would lose energy by radiation

  4. Classical Precession of Multiple Spins • Precession of multiple spins aligned along and against the magnetic field • More spins aligned along than against the magnetic field • No net transverse component

  5. Net Nuclear Spins and Resultant M0 • Net nuclear spins and resulting nuclear magnetization M0 • Can use M0 instead of individual nuclear spins

  6. Rotating Frame • The gray platform illustrates the rotating frame • From the viewpoint of the rotating frame the nuclear magnetization M0 appears stationary

  7. Tipping of Magnetization by RF • Tipping of magnetization M0 by an on-resonance RF field • M0 can be tipped into the transverse plane

  8. Tipping of Magnetization by RF • Tipping of magnetization M0 by an off-resonance RF field • M0 does not go through the negative Z axis

  9. Tipping of Magnetization by RF • Two views of off-resonance irradiation

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