98 Chapter 6 Eigen values ʎ1, ʎ2 and ʎ3 Table 2 summarizes the ƞ2 of ʎ 1, ʎ2, ʎ3 by white matter tract. Left and right hemispheres show regional asymmetries. The genu of the corpus callosum, and the hippocampal segment of the left cingulum bundle show a ƞ2 >0.14 in ʎ 2 or ʎ3. Table 2. Overview of ƞ2 of MANOVAs ʎ1, ʎ2 and ʎ3 in patients vs controls λ1 λ2 λ3 CST left 0,07 0,00 0,01 CST right 0,04 0,00 0,01 Corpus Callosum Genu 0,04 0,13 0,14 Corpus Callosum body 0,01 0,07 0,07 Corpus Callosum Splenium 0,01 0,04 0,05 MCP 0,13 0,00 0,00 Fornix Left 0,00 0,00 0,00 Fornix Right 0,01 0,00 0,01 Cingulum Hippocampal left 0,07 0,14 0,13 Cingulum Hippocampal right 0,03 0,12 0,07 Cingulum Body left 0,00 0,10 0,08 Cingulum Body right 0,00 0,11 0,06 *For ʎ1, ʎ2 and ʎ3 a ƞ2 was calculated, in which Cohen’s guideline for “high” is ƞ2 >0.14 The summary shape of the tensors of each voxel in a 3D ellipsoid is shown in Figure 2 with the mean ʎ1, ʎ2, ʎ3 of patients and controls for the corpus callosum genu and hippocampal segment of the left cingulate bundle. We see the three major, medium and minor axis of the diffusion displacement. Both ellipsoids show any degree of anisotropy, orientation in 3D space. The control group shows smaller ellipsoids in comparison with sCS patients. The corpus callosum shows a more anisotropic ellipsoid then the cingulate bundle, which has a more Gaussian appearance.
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