spin echo


spin ech·o

a commonly used technique to recover T1 and T2 relaxation signals in magnetic resonance imaging, by using a 180° inverting pulse in the pulse sequence to compensate for loss of transverse magnetization caused by magnetic field inhomogeneities.

spin echo

An MRI term for the reappearance of NMR signal after the free induction decay (FID) ends, caused by reversal (rephasing) of the dephasing spins by specific RF pulse sequences or pairs of field gradient pulses, applied in time shorter than or on the order of T2.
Proper selection of the echo time of the pulse sequence can help control the amount of T1 or T2 contrast present in the image.

spin echo

(spin ek'ō) A commonly used technique to recover T2 relaxation signals in magnetic resonance imaging, by using a 180-degree inverting pulse in the pulse sequence to compensate for loss of transverse magnetization caused by magnetic field inhomogeneities.