Mean values (± SD) for absolute and relative fractional anisotropy and coefficient Dav in the three groups of lesions of increasing hypointensity on the T1-weighted images
| FA | Dav (×10−3 mm2/s) | ΔFA | |
|---|---|---|---|
| T1 isointense (n = 25) | 0.26 ± 0.07 | 1.29 ± 0.17 | 19 ± 4 |
| T1 mildly hypointense (n=26) | 0.21 ± 0.06 | 1.54 ± 0.31 | 23 ± 6 |
| T1 severely hypointense (n=25) | 0.19 ± 0.06 | 1.80 ± 0.32 | 36 ± 4 |
Note.—FA indicates fractional anisotropy; Dav, averaged diffusivity; ΔFA, percentage FA variation in the lesion, obtained in relation to a symmetric normal appearing white matter area in the contralateral hemisphere.