A PSO-Powell Hybrid Method to Extract Fiber Orientations from ODF

Figure 5

Fiber orientations extracted from ODF fields of Tractometer. In (a), two ROIs are marked out by red squares. (b) and (h) are ODF fields constructed with QBI. (d) and (j) are ODF fields constructed with CSA-QBI. (f) and (p) are ODF fields constructed with DOT. (c), (e), (g), (i), (k), and (q) show the fiber directions extracted from (b), (d), (f), (h), (j), and (p), respectively. (r) shows the ground truth fibers of Tractometer phantom. The directions marked out by black polygons do not correspond with the ground truth.