Hyperstreamlines and streamribbons for a tract from the corpus callosum.

<p>Axial (a) and coronal (b) slices of the brain of the two subjects (subject one: a) and c); subject two: b) and d)) are shown, with a tract from the lateral projections of the corpus callosum (latCC) visualized as multi-fiber hyperstreamline. The boxed regions in a) and b) are enlarged in c) and d), respectively, showing the construction procedures of the hyperstreamline and streamribbon. Starting from the middle of the brain, the fiber tracts first cross the cortico-spinal tracts (CST) before intersecting the arcuate fasciculus (AF) more laterally. From the visualizations in c) and d), regions with three distinct fiber populations can be seen along the tracts, i.e., where the AF and CST both cross the latCC pathway. This is highlighted when color-encoding the hyperstreamline by the number of ODF peaks (red arrow).