Figure 5.

In (A), the centralized eigenvalues (λ₁, λ₂, λ₃) of the diffusion tensor matrix (D) are plotted as a function of the corresponding eigenvalues of the orientation distribution matrix (T). In (B), the diffusion tensor fractional anisotropy (FA_D) is plotted as a function of a scaled version of the orientation matrix fractional anisotropy (FA_T), see text for details. The results of fitting the simulated diffusion MRI data using a cumulant expansion expression are presented for centralized eigenvalues (C) and FA (D). The black and red symbols correspond to points where the DTI model explains more (black) or less (red) than 95% of the signal variation. Human neocortical neurons from the NeuroMorpho.org database were used for this analysis. The eigenvalues are in units of μm²/ms.