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Unformatted text preview: After a 90 degree pulse the magnetization M, rotates into the xy plane and then will precess around B . A signal is detected which decreases in magnitude with characteristic time T 2 *. The damped oscillating signal is called Free Induction Decay (FID). A sequence of pulses can be applied; this can be used to measure T 1 and T 2 . A particular sequence results in a spin echo signal in which the effect of the non-uniform magnetic field is removed. See the article from Physics World....
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- Spring '10