(FAST) A gradient echo sequence with steady state free precession.

See Gradient Echo Sequence and Steady State Free Precession.

(FIESTA) The fast imaging employing steady state acquisition sequence provides images of fluid filled structures with very short acquisition times. The FIESTA sequence uses the T2 steady state contrast mechanism to provide high SNR images with strong signal from fluid tissues while suppressing background tissue for contrast and anatomic detail of small structures. In addition, the ultra short TR and TE enable extremely short acquisition times - shorter than FSE - and the images can be post processed using MIP, volume rendering, or 3D navigator techniques.

See Steady State Free Precession.

(IR FGR) A gradient echo sequence with an inversion pulse.

See Gradient Recalled Echo Sequence, Inversion Recovery and Steady State Free Precession.

(RE MRI) There are several approaches to speeding up the MRI data acquisition process by repeating the excitation by RF pulses in times short compared to T1, typically using small flip angles and gradient echo refocusing. When TR is also on the order of or shorter than T2, the repeated RF pulses will tend to refocus transverse magnetization remaining from prior excitations, setting up a condition of steady state free precession, and a dependence of signal strength (and image contrast) on both T1 and T2.
This can be modified in various ways, particularly:
1) to spoil the tendency to build up a steady state by reducing coherence between excitations, e.g. by variation of the phase or timing of consecutive RF pulses or of the strength of spoiler gradient pulses, thus increasing the relative dependence of signal strength on T1 or
2) acquire the signal when it is refocusing immediately prior to the next RF pulse, thus increasing the relative dependence of signal strength on T2.

See also Ultrafast Gradient Echo Sequence.

(ROAST) A gradient echo sequence.
See Refocused Gradient Echo Sequence and Steady State Free Precession.