Fig. 7.

Normalized histograms of 95% cones of orientation uncertainty in white matter, using different models. Voxels have been selected using an eroded WM mask, segmented from a T1-weighted anatomical scan. The two columns correspond to uncertainty on the principle v₁ and secondary v₂ fiber orientation, respectively. Each row corresponds to different RubiX models with different number L of orientation prior modes. No ARD priors were used for the volume fractions. The dashed lines aid visualization and illustrate the values at which each histogram attains its first peak.