title: Diffusion tensor imaging in medial temporal lobe epilepsy.
abstract: 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.
authors.affiliation: Department of Radiology, Xuanwu Hospital, Capital University of Medical Sciences, Beijing 100053, China.
authors.forename: Ai-hong
authors.initials: AH
authors.lastname: Yu
authors.forename: Kun-cheng
authors.initials: KC
authors.lastname: Li
authors.forename: Chun-shui
authors.initials: CS
authors.lastname: Yu
authors.forename: Yu-ping
authors.initials: YP
authors.lastname: Wang
authors.forename: Su-fang
authors.initials: SF
authors.lastname: Xue
mesh_terms: 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