Table 2.
Means and Standard Deviations (Std) of the Three Metrics (KL Divergence, L1 Norm, and L2 Norm) as Functions of b Values
| b | 0.5 | 1 | 1.5 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|
| KL (Mean) | 2.63e-3 | 6.75e-4 | 4.01e-4 | 3.86e-4 | 3.96e-4 | 5.65e-4 | 8.01e-4 | 1.34e-3 | 2.40e-3 | 3.31e-3 |
| KL (Std) | 3.30e-4 | 2.30e-4 | 9.86e-5 | 1.53e-4 | 1.18e-4 | 1.62e-4 | 1.70e-4 | 4.67e-4 | 4.84e-4 | 3.61e-4 |
| L1 (Mean) | 3.05e-4 | 1.79e-4 | 1.39e-4 | 1.32e-4 | 1.37e-4 | 1.51e-4 | 1.70e-4 | 2.15e-4 | 2.70e-4 | 3.20e-4 |
| L1 (Std) | 2.84e-5 | 2.68e-5 | 1.93e-5 | 2.35e-5 | 2.20e-5 | 2.51e-5 | 2.20e-5 | 2.98e-5 | 3.34e-5 | 1.81e-5 |
| L2 (Mean) | 2.88e-3 | 1.47e-3 | 1.14e-3 | 1.10e-3 | 1.12e-3 | 1.33e-3 | 1.58e-3 | 2.03e-3 | 2.72e-3 | 3.21e-3 |
| L2 (Std) | 1.82e-4 | 2.25e-4 | 1.32e-4 | 2.24e-4 | 1.66e-4 | 1.86e-4 | 1.68e-4 | 3.42e-4 | 2.77e-4 | 1.71e-4 |
For each b value, 100 simulations of two-tensor systems (equal volume fractions; 90° crossing) were computed with a SNR of 15. Here, b values are scaled by 1,000 (i.e., a value of 2 represents 2,000 sec/mm2). Please also refer to Fig. 1 for more details.