Table 2.
Compares the fiber length and number for different tractography algorithms except Probtrackx.
| Fiber length (mm) |
Total number |
||||||
|---|---|---|---|---|---|---|---|
| Mean | Median | Maximum | Fibers | Short fibers | Ratio (%) | ||
| Tensor | FACT | 33.30 ± 2.85 | 22.55 ± 2.09 | 229.48 ± 52.81 | 43301 ± 7359 | 11206 ± 1466 | 25.88 |
| RK2 | 38.22 ± 3.37 | 25.75 ± 2.72 | 279.67 ± 48.05 | 47699 ± 7808 | 12073 ± 1465 | 25.31 | |
| SL | 42.95 ± 3.90 | 31.36 ± 3.42 | 291.38 ± 68.39 | 48205 ± 7853 | 9756 ± 1168 | 20.24 | |
| TL | 43.65 ± 3.99 | 32.44 ± 3.57 | 291.12 ± 43.07 | 44489 ± 7526 | 8366 ± 1031 | 18.80 | |
| ODF | FACT | 23.87 ± 1.76 | 15.80 ± 1.18 | 152.29 ± 14.81 | 56674 ± 10063 | 20051 ± 2984 | 35.38 |
| RK2 | 27.03 ± 2.18 | 17.36 ± 1.53 | 188.16 ± 29.66 | 65626 ± 11202 | 22884 ± 3184 | 34.87 | |
| ODF | PICo | 26.37 ± 1.97 | 17.92 ± 1.22 | 174.58 ± 21.70 | 503527 ± 82907 | 144907 ± 19699 | 28.78 |
| Hough | 54.51 ± 3.29 | 57.12 ± 0.55 | 109.49 ± 1.96 | 10000 | 374 ± 309 | 3.74 | |
Values are computed from all 202 subjects; mean and median values of fiber length are computed using all fibers. We noticed most short fibers were extracted at the brain periphery, mainly due to noise in the images, and hence, all fibers shorter than 10 mm were called “short fibers” and were removed from downstream analysis. Column Ratio is the proportion of all fibers that were short fibers.