Figure 2.

Parameter maps from the representation‐based analysis (Equation (1)) of b‐tensor data. (a) The mean diffusivity (MD) contrast was similar between white and gray matter. The level of isotropic heterogeneity (MK_I) was generally low but higher in regions with partial volume effects from CSF. The level of microscopic anisotropy (MK_A) was high in white matter and low in gray matter such as the cortex. (b) The level of microscopic anisotropy reflected the level of myelination seen in a coronal myelin‐stained histology slice (obtained from a different subject). From left to right: (1) the myelin‐poor mediodorsal thalamus, (2) the myelin‐rich ventrolateral thalamus, and (3) the internal capsule. Voxels with MD ≥ 2 μm²/ms are colored blue. The shown example is from group A [Color figure can be viewed at http://wileyonlinelibrary.com]