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MRI: proton relaxation signal direction

  1. Nov 19, 2004 #1
    In all situations (that I can think of) of particles relaxing from an excited state to their ground state, the direction of the resultant photons is isotropic.
    In magnetic resonance imaging (MRI) the excited protons are all in the -Z direction (+ some thermal motion). Will this have any bearing on the direction of motion of the resulting relaxation photons?
  2. jcsd
  3. Nov 19, 2004 #2
    No. The RF emitted during relaxation is still isotropic.
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