2016_Imaging for Physicists
Steady State Sequences
• Spoiling (or ‘incoherent steady state’) – Removes residual transverse signal – Use RF (or gradient) spoiling
RF phase angle increased to produce net cancellation of transverse magnetization – Incomplete spoiling leads to ‘FLASH-bands’
FLASH (Turbo-FLASH) SPGR (FSPGR) RF-FAST
] ( exp
)
[
(
) T TR 1
* T TE 2
/ exp 1 sin
/
α
− −
−
S
∝
(
) T TR 1
exp cos 1 α
/
−
−
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