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. Author manuscript; available in PMC: 2012 Jan 1.
Published in final edited form as: Magn Reson Med. 2011 Jan;65(1):128–137. doi: 10.1002/mrm.22611

Figure 9.

Figure 9

Analysis of white matter compensation method. (A) The effect of error in assumed white matter flow on the error in gray matter flow. (B) The use of white matter correction method assumes the time delay Δt from tagged slab to ROI to be the same as the time delay to the white matter. The error in hippocampal CBF (vertical axis) corresponding to variable difference ΔtWM - ΔtHIP between Δt for the white matter and for the hippocampus (horizontal axis), was simulated assuming ΔtWM = 600 msec and TI=1.2 s. Relatively low CBF errors are expected, provided time delay discrepancy is under 200 ms.