846 / 945
•
Rewinding (SS-FID)
–
Maintains coherent transverse magnetisation
–
FISP, GRASS rewind phase encoding only
–
‘True’ FISP or bFFE rewind all 3 gradient
directions
Have to additionally phase cycle RF (ROAST)
•
Time Reversed sequences (SS-Echo)
–
PSIF
–
Use (Hahn) echo -essentially T
2
-weighted
FAST
FISP
GRASS
bFFE/bSSFP
FIESTA
CE-FAST
PSIF
SSFP
Signals depend on:
flip angle, T
1
/T
2
Steady State Sequences