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Diffusion tensor changes in epileptogenic hippocampus of TLE patients.

D Liacu1, G de Marco, D Ducreux

  • 1Department of Neuroradiology, CHU de Bicêtre, Le-Kremlin-Bicêtre cedex, France. dliacu@yahoo.com

Neurophysiologie Clinique = Clinical Neurophysiology
|June 2, 2010
PubMed
Summary

Diffusion tensor imaging (DTI) reveals subtle hippocampal abnormalities in temporal lobe epilepsy (TLE) patients, even when conventional MRI appears normal. DTI metrics differentiate these changes from those seen in hippocampal sclerosis (HS).

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Area of Science:

  • Neuroimaging
  • Epilepsy Research
  • Quantitative MRI

Background:

  • Conventional magnetic resonance imaging (MRI) often fails to detect subtle brain abnormalities in temporal lobe epilepsy (TLE).
  • Diffusion tensor imaging (DTI) offers quantitative insights into brain microstructural changes.
  • Understanding these microstructural differences is crucial for diagnosing and managing TLE.

Purpose of the Study:

  • To investigate the utility of DTI in detecting hippocampal abnormalities in TLE patients.
  • To compare DTI findings between TLE patients with normal conventional MRI and those with hippocampal sclerosis (HS).
  • To assess the diagnostic value of fractional anisotropy (FA) and mean diffusivity (MD) in TLE.

Main Methods:

  • Seventeen medically treated TLE patients and ten healthy controls underwent DTI acquisition.

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  • TLE patients were categorized into MRI-negative and HS groups based on conventional MRI findings.
  • Fractional anisotropy (FA) and mean diffusivity (MD) were measured in bilateral hippocampi.

    • Main Results:

    • MRI-negative TLE patients showed increased ipsilateral hippocampal anisotropy compared to controls.
    • HS patients exhibited significant differences in both anisotropy and diffusivity in the ipsilateral hippocampus versus controls.
    • DTI identified distinct hippocampal abnormalities in TLE patients with normal conventional MRI.

    Conclusions:

    • DTI can detect hippocampal abnormalities in TLE patients with normal conventional MRI, distinguishing them from HS.
    • Combining diffusivity and anisotropy indices enhances the specificity of DTI measurements in TLE.
    • DTI provides valuable quantitative biomarkers for TLE diagnosis and characterization.