Lecture 23: 1. MRI noise processes. MP574. Dipole Moments from Entire Sample. Magnetic Field (B 0 ). Magnetic Field (B 0 ). m. m. Positive Orientation. Negative Orientation. Source of Signal. Proton or Water MRI B o Magnetic Field Proton Nucleus S = ±ħ/2. rg. 2. 2. h. D E.
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I = “in phase”
Q = “quadrature” or 90o out of phase