Crossing fiber regions in the superior longitudinal fasciculus (SLF).

<p>Sub-regions of the SLF marked on a directionally encoded color map (top row) and planar diffusion coefficient encoded (Cp) map (bottom row). The planar diffusion coefficient ranges from zero to one and is relatively high in voxels were the tensor has a disc-like shape, which is typically the case when two fiber populations “cross”. The white line marks a sub- region of the SLF containing voxels with relatively few “crossing fibers”, which is reflected by a Cp close to zero. By contrast, the more anterior sub-region of the SLF, marked in yellow, contains relatively many voxels with “crossing fibers”, due to crossing with the cortico-spinal tract and/or laterally projecting fibers of the corpus callosum. This is reflected by a Cp closer to one.