spin echo

spin echo

noun

Definition of SPIN ECHO

: a signal that is detected in a nuclear magnetic resonance spectrometer, that is an echo-like replication of a free induction decay produced by a planned series of radio-frequency pulses, and that can be used to extract more information from a test sample or subject than conventional nuclear magnetic resonance spectroscopy—usually used attributively <spin-echo magnetic resonance imaging of the cervical spine>; compare gradient echo