White and gray matter ROIs used for calculating DTI metrics in a single subject. Similar ROIs were used in the second subject. A, Anterior and posterior corpus callosum (red). B–D, Deep white matter (left and right occipital, frontal, and parietal, respectively; blue). E, Left and right periventricular white matter (green). F, Left and right cortical gray matter (gray). G and H, Left and right deep gray matter (putamen, white).