Figure 7.

Greater angular sampling improves ODF reconstruction more when the ROI contains fiber crossings. The top row (a) shows ODF fields calculated from datasets with different angular resolutions; (b) shows the discrepancy (sKL) between the ODFs at the highest angular resolution versus ODFs from downsampled data with lower angular resolutions; (c,d) show sKL vs. angular resolution for two ROIs: the splenium of the corpus callosum (CC) and for fiber crossings in the SLF (superior longitudinal fasciculus), corona radiata, and corpus callosum. The ODF reconstruction error (sKL) for the CC is much smaller than in the fiber crossing region. In addition, the greater angular sampling offers greater improvement for reducing the ODF estimation error in the ROI where fibers cross. [Color figure can be viewed in the online issue, which is available at http://wileyonlinelibrary.com.]