(CRISP) A specific pulse sequence, wherein the application of strategic gradient pulses can compensate for the objectionable spin phase effects of flow motion.

Flow compensation is based on the principle of even echo rephasing and a function of specific pulse sequences, wherein the application of strategic gradient pulses can compensate for the objectionable spin phase effects of flow motion. Gradient moment nulling of the first order of flow is another adjustment for the reduction of flow artifacts.
Gradient field changes can be configured in such a way that during an echo the magnetization signal vectors for all pixels have zero phase angle independent of velocities, accelerations etc. of the measured tissue. The simplest velocity-compensated pulse sequence is the symmetrical second echo of a spin echo pulse sequence.
Strategic gradient pulses are integrated in special sequences (e.g. CRISP, Complex Rephasing Integrated with Surface Probes) and for the most sequences flow compensation is an optional parameter.

A series of 180° RF rephasing pulses and their corresponding echoes for a fast or turbo spin echo pulse sequence.

See Fast Spin Echo and Turbo Spin Echo Turbo Factor.

The number of series of 180° RF rephasing pulses and their corresponding echoes for a fast or turbo spin echo pulse sequence.

See Fast Spin Echo.

A specialized technique usually associated with short TR, reduced flip angle and repeated 180° rephasing pulses.