| free induction decay |
(FID) - if transverse magnetization of the spins is produced, eg by a 90?pulse, a transient NMR signal will result that will decay toward zero with a characteristic time constant T2 (or T2*); this decaying signal is the FID. In practice, the first part of the FID is not observable due to residual effects of the powerful exciting RF pulse on the electronics of the receiver.
출처: www.emrf.org/Education%20and%20Training/Glossary%2...
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