Skip to main content
. Author manuscript; available in PMC: 2012 Sep 1.
Published in final edited form as: Magn Reson Imaging. 2012 May 11;30(7):907–915. doi: 10.1016/j.mri.2012.03.006

Fig. 2.

Fig. 2

(A) Example simulation of the IR-TFE sequence signal as a function of TI for TS=3700 ms for WM (solid) and GM (dashed), and (B) computation of the TIs nulling WM (solid) and GM (dashed) signal as a function of TS. Computations used TFE=165, TR=4.1 ms, FA=8° and tissue parameters from Table 1. To simulate the effects of RF inhomogeneity, both the inversion pulse and the readout flip angle, α, were scaled by a scaling factor. For crf=1: α=8°, IR pulse=180° (black line); for crf=0.80: α=6.4°, IR pulse=144° (gray line). Note that the TI nulling WM decreases from 595 to 510 ms for crf=1.0 and 0.80 [indicated by two vertical dotted lines on the left of (A)], respectively. The TI nulling point also decreased GM from 900 to 790 ms [indicated by two vertical dotted lines on the right of (A)]. For the TS/TI pairs in (B), absolute GM signal is larger than WM signal. The horizontal dotted lines correspond to the nulling points in (A) and where they intersect a TS=3700 ms.