Fig. 4.

Comparison of computed and measured orientations: (a) The orientation maps of a sagittal section share the same color-coding (color wheel), and the brightness is controlled by the en-face retardance values. CPu: caudate putamen, TH: thalamus, cc: corpus callosum, and ic: internal capsule. (b) Mean (circles) and standard deviation (bars) of the difference between computed and measured fiber orientations are plotted for all ROIs and respective slices. Pixels having low retardance ($<233\mathrm{nm}$) are excluded in the statistical analysis. ROIs of the first three plots are indicated on (a). ROI of the last plot contains multiple fiber bundles as shown in Fig. 2 including f, fr, mt, and sm. The ROIs are across multiple slices [$x$-axis in (b)].