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. 2012 Sep 19;33(1):67–75. doi: 10.1038/jcbfm.2012.125

Figure 3.

Figure 3

(A) Mean fitted value of vbw (vascular volume fraction) as a function of input vbw value from the diffusion-weighted imaging (DWI) Monte Carlo simulations, at signal-to-noise ratio (SNR)=120. (B) Variation of mean fitted permeability-surface product (PS) as a function of input PS value from the arterial spin labeling (ASL) Monte Carlo simulations, at SNR=10, with vbw=2 mL blood/100 g tissue (mean value from in vivo data). In both plots, filled circles represent the mean fitted value after 1,000 iterations, and error bars represent s.d. The dashed lines represent input value=fitted value. (C) 2D precision plot of fitted PS values. Color indicates SD of the fitted PS value over 1,000 Monte Carlo simulations, as a function of both input vbw value (horizontal axis) and input PS value (vertical axis). Typical parameters found in human gray matter at 1.5 T were used to generate all synthetic data (Table 2). The color reproduction of this figure is available on the Journal of Cerebral Blood Flow and Metabolism journal online.