Table 3. Estimated values of the diameter, 2R, and axonal volume fraction, v, for the center part of the corpus callosum in normal cases, estimated by fitting our proposed model to the DWI data.

	2R (µm)	V
TR01	0.60±0.13	0.38±0.07
TR02	0.54±0.11	0.36±0.08
TR03	0.52±0.10	0.41±0.09
TR04	0.49±0.09	0.38±0.06

The results are consistent with the measured values shown in Tables 1 and 2. The intra-class correlation coefficients within 95% of the confidence interval are 0.970 (p = 0.008) and 0.933 (p = 0.026) for the diameter and volume fraction of the axons, respectively.