Magnetization transfer and diffusion tensor MR imaging of the optic radiations and calcarine cortex from patients with Leber's hereditary optic neuropathy
M. Inglese et al., Magnetization transfer and diffusion tensor MR imaging of the optic radiations and calcarine cortex from patients with Leber's hereditary optic neuropathy, J NEUR SCI, 188(1-2), 2001, pp. 33-36
Optic nerve abnormalities are easily detectable in patients with Leber's he
reditary optic neuropathy (LHON), using magnetic resonance imaging (MRI). H
owever, the presence of structural chances in the optic radiations and calc
arine cortex of these patients is still an unresolved issue. In this study,
we obtained magnetization transfer WT) and diffusion tensor (DT) MRI to in
vestigate the integrity of these structures in patients with LHON.
Dual echo, MT- and DT-MRI scans of the brain were obtained from 10 men with
LHON and 10 healthy sex- and age-matched controls. After image co-registra
tion, we obtained MT ratio (MTR), average diffusivity ((D) over bar) and fr
actional anisotropy (FA) maps. MTR, (D) over bar and FA values for the whit
e matter of the optic radiations and MTR and (D) over bar values for the ca
lcarine cortex were obtained using a region of interest (ROD analysis.
No macroscopic abnormalities were detected in any of the scans from LHON pa
tients and controls. No statistically significant differences of MTR, (D) o
ver bar or FA values were found for any of the regions studied in LHON pati
ents and healthy controls. Our results suggest that, in patients with LHON,
the optic radiations and the calcarine cortex are spared from structural d
amage, both at a macroscopic and a microscopic level. (C) 2001 Elsevier Sci
ence B.V. All rights reserved.