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

/

−

−