The τi-dependence of the natural logarithm of the fitting goodness measure, χ2, for data from the three (Fig. 1c-f) ROIs: suspicious, NAG, and muscle. The model used was SSM(FXR-a) [Eq. (5), ], but with only two parameters (Ktrans and ve) varied. The τi parameter was held fixed at each value on the abscissa. The minimum χ2 values are seen at τi = 450, 250, and 750 ms for suspicious, NAG, and muscle, respectively; with increasing uncertainties.