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gradient echo

n :  a signal that is detected in a nuclear magnetic resonance spectrometer that is analogous to a spin echo but is produced by varying the external magnetic field following application of a single radiofrequency pulse rather than by application of a series of radiofrequency pulses and that can be used to extract more information from a test sample or subject than is possible in conventional nuclear magnetic resonance spectroscopy - usu. used attributively <gradient-echo magnetic resonance imaging of the brain>  .

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