Fig 7. ROI analysis for patients with acute HCP, before and after surgery at the level of the internal capsule (data are averaged over all patients in each group). A, Analysis of the radial diffusivity shows significantly lower values before surgery compared with those of control subjects and increased values after surgery approximating control values. B, Analysis of the parallel diffusivity shows significantly higher values before surgery compared with those of control subjects and decreased values after surgery approximating control values. C, To reduce intersubject variability, we compared data for each subject with his or her own presurgery values; this analysis showed 25% increase in radial diffusivity and 10% decrease in parallel diffusivity after surgery.