Fig 1. ROI selection in a control subject (A) and a patient with acute HCP (B). A, Three representative images of color-coded FA maps. Using a DTI-based atlas of white matter tracts, one can define specific white matter fascicules.⁽²⁰⁾ Superimposed polygons on color-coded maps identifies the 7 ROI groups that were analyzed in this study (magnified below). For each ROI group, data were measured in another 2 sections and for the left and right hemispheres (not shown). The ROI groups include the following: the posterior limb of the internal capsule,⁽¹⁾ the genu of the corpus callosum,⁽²⁾ the splenium of the corpus callosum,⁽³⁾ the subcortical frontal white matter,⁽⁴⁾ the subcortical temporal white matter,⁽⁵⁾ the optic radiation,⁽⁶⁾ and the superior longitudinal fascicules.(⁷) B, The same ROI groups are used for the patient with acute HCP with the largest ventriculomegaly. All ROI groups except the splenium of the corpus callosum could be identified for this patient.