Figure 14. Three-dimensional plots of 40 histograms of (a) Monte Carlo estimated relative cerebral blood volume (rCBV) and (b) mean transit time (MTT) values, normalized to have median values of 0. Values were obtained with signal-to-noise ratio (SNR) ranging from 8.8–8.3. Each histogram contains 104 samples. The widths of the histograms are measures of the variation of rCBV and MTT values which represent the uncertainties in the calculation of rCBV and MTT.