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. Author manuscript; available in PMC: 2010 Jul 16.
Published in final edited form as: Magn Reson Med. 2010 May;63(5):1210–1218. doi: 10.1002/mrm.22288

FIG. 4.

FIG. 4

Bloch simulation for IR-SPGR. We calculated the signal evolution for GM, WM, and CSF using typical parameters TI/TD = 900/600 ms and Q/TE/TR/θ = 120/2 ms/12 ms/15° (a). The signal evolution stabilizes after about two full cycles of the prepare-acquire-recover outer loop. During the acquisition segment, WM/GM signal difference starts out high because of the preparation, but decays away with each readout (b). The magnetization levels are normalized such that CSF magnetization at equilibrium equals 1.