Table 1.

Fractional anisotropy and mean diffusivity for different lesion subtypes

SubtypeNo. of regionsFractional anisotropy, dimensionless unitMean diffusivity, ×10−3 mm2/sec
MinimumMaximumMean (SD)MedianMinimumMaximumMean (SD)Median
NAWM = normal-appearing white matter; E = enhancing; NE = nonenhancing; I = isointense; H = hypointense.
NAWM (control)2610.290.870.60 (0.13)0.600.591.100.84 (0.08)0.84
NAWM (MS patient)2060.260.840.56 (0.12)0.560.691.170.88 (0.08)0.87
Lesions (all)2700.250.830.50 (0.12)0.480.742.121.11 (0.21)1.05
Lesions (NE, I)2300.250.830.51 (0.12)0.490.742.121.09 (0.21)1.03
Lesions (NE, H)150.310.580.47 (0.08)0.461.001.801.24 (0.21)1.25
Lesions (NE, I + H)2450.250.830.51 (0.12)0.490.742.121.10 (0.22)1.04
Lesions (E)250.250.600.38 (0.09)0.360.901.571.16 (0.17)1.14