Fig 1. DTI fiber tracking and segmentation. A, DTI fiber tracks (red) were launched from a starting region of interest (green mesh) in a plane adjacent to the trigone of the lateral ventricle. Fiber tracks were filtered with a second region of interest (blue mesh) in a plane posterior to the lateral ventricle. B, The average fiber track (yellow) was constructed by averaging coordinates from each of the delineated optic radiation fiber tracks (red). C, The average fiber track was divided into 7-mm segments. Each voxel within the delineated optic radiation is assigned to the closest segment. Different segments are shown with various colors. D, Each discrete 7-mm segment is assigned to either the anterior, middle, or posterior anatomic segment of the optic radiation. The background image in each panel is an echo-planar image without diffusion weighting.