Net magnetisation precession & signal induction
A vertical B0 axis carries the equilibrium magnetisation M0. A 90 degree radiofrequency pulse tips it into the transverse plane, where the coherent transverse magnetisation Mxy precesses at the Larmor frequency omega-nought equals gamma B0. The changing magnetic flux threads a receiver coil, which by Faraday's law (V equals minus d-phi by d-t) develops an induced voltage, seen as the free induction decay signal that decays with T2 star.
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