free induction decay

free induction decay
free induction decay n a time-based electrical signal that is detected in a nuclear magnetic resonance spectrometer, that is produced by induction from the motion of the magnetic moments of nuclei, that decays with time, that can be converted to a more conventional frequency-based signal using analysis by Fourier transforms, and that with a suitable display can be used to extract more information from a test sample or subject than is possible in conventional nuclear magnetic resonance spectroscopy abbr. FID

* * *

the signal analyzed in magnetic resonance imaging or spectroscopy; it results from the emission of energy by nuclei after they are excited by a pulse of radio frequency waves.

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