Figure 7:

ODI, NDI, and V_iso maps derived from 2, 3, and 4 shells (subsampled from 8 shells diffusion dataset as the pseudo ground-truth). Plots of voxel correspondence for the selection of shells vs the pseudo ground truth are shown for the ROI (blue box) in figure 6s – 6ab. Significant artifacts are shown in both ODI and NDI (white, red, and yellow arrows, c, i) maps when using the highest four b values (5000, 6000, 7000, 8000 s/mm²). The inconsistences also show in V_iso images (white, red, and blue arrows, o). The calculated ODI and NDI show visually inconsistent results in some specific areas when only using lowest four b values (1000, 2000, 3000, 4000 s/mm²). The results become more consistent with the pseudo ground-truth when using 4 shells (1000, 3000, 5000, 7000 s/mm²) or 3 shells (1000, 4000, 8000 s/mm²). All the images are obtained from the left hemisphere.