Crossing fiber regions reflected by the planar diffusion coefficient.

<p>The superior longitudinal fasciculus (SLF) and medial segment of the corpus callosum (CC) color coded according to the value of the planar diffusion coefficient (Cp) (for interpretation of the color coding see also fig. 3). The figure shows regions with “crossing fibers” reflected by a Cp close to one (green) and regions with relatively few “crossing fibers” reflected by a Cp close to zero (red). a) the SLF shows many regions with “crossing fibers” due to crossing with the cortico-spinal tract and/or laterally projecting fibers of the corpus callosum (CC) in frontal regions, and with the inferior longitudinal fasciculus in temporal regions. b) In the midsagittal segment of the CC one fiber population predominates.