Diffusion tensor imaging in medial temporal lobe epilepsy.
BACKGROUND
Diffusion tensor imaging (DTI) is a noninvasive imaging technique for the assessment of the integrity of cerebral tissues. This study was undertaken to assess the changes of diffusion indices of hippocampal formation (HF) in patients with medial temporal lobe epilepsy (MTLE).


METHODS
Fourteen patients with MTLE and 14 healthy subjects were evaluated. Mean diffusivity (MD) and fractional anisotropy (FA) from the symmetrical-voxel sampling regions of the anterior HF were calculated in all subjects. The MD and FA values were compared across the groups.


RESULTS
No significant differences of MD and FA values were noted between right and left HF in the controls. In the patient group, MD significantly increased in the HF ipsilateral to the lesioned side [(9.27 +/- 1.09) x 10(-4) mm(2)/s], compared with the values in the contralateral HF [(8.20 +/- 0.59) x 10(-4) mm(2)/s] (t = 4.479, P = 0.001) and healthy subjects [(7.58 +/- 0.51) x 10(-4) mm(2)/s] (P < 0.001), but no significant differences were found in FA. When compared with the controls, patients had a significantly higher MD in the contralateral HF (P < 0.05), but the difference in FA was not statistically significant.


CONCLUSIONS
DTI could detect hippocampal abnormality in patients with MTLE. This technique may be helpful for preoperative evaluation of such patients.
Yu
Ai-hong
AH
Department of Radiology, Xuanwu Hospital, Capital University of Medical Sciences, Beijing 100053, China.
Li
Kun-cheng
KC
Yu
Chun-shui
CS
Wang
Yu-ping
YP
Xue
Su-fang
SF
D000293:Adolescent; D000328:Adult; D016880:Anisotropy; D002648:Child; D038524:Diffusion Magnetic Resonance Imaging / Q000379:methods*; D004833:Epilepsy, Temporal Lobe / Q000473:pathology*; D005260:Female; D006624:Hippocampus / Q000473:pathology*; D006801:Humans; D008297:Male