FIG 1. A, Quantitative D_av map shows ROIs (boxes) in the location of clinically suspected region of brain (right motor cortex) and contralateral control site. These two measurements were used to calculate the ratio m1.

B, Quantitative D_av map shows regions used for measurements made on right and left thalami (boxes) for calculating the control ratio of c1.

C, Mean value of the brain tissue diffusion constant (BD_av) and width of the distribution () were determined from the distribution analysis map by using a three-compartmental model (see Methods). This value was used in determining the ratios m3 and c3. Data are shown as circles, and the fit is shown as a line.