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STIR
Short Tau Inversion Recovery. type of T2 sequence with a 180 degree inversion recovery pulse followed by a 90 degree refocusing pulse. good for suppressing fat and showing trauma or infection.
T1
TR 350-750ms. TE as small as possible. short TR, Short TE. anatomy scan, fluid is dark, fat is bright
T2
TR 3200-6500ms. TE 80-140ms. long TR, long TE.
GRE
Gradient Echo Sequence. Only 90 degree pulses and variable flip angles (no 180). gradient allows less than 90. Shorter TE and shorter TR because no 180 pulse.
FLAIR
Fluid Attenuated Inversion Recovery. Supresses fluid - used in brains and spines to supress CSF. 1700-2200 ms inversion time (longer than STIR). T2 FLAIR used to see MS, subarachnoid hemmhorage, menengitis