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Related Experiment Videos

Water diffusion in the human hippocampus in epilepsy

U C Wieshmann1, C A Clark, M R Symms

  • 1NSE Epilepsy Research MRI Unit, Epilepsy Research Group, Institute of Neurology, London, UK. uwiesh@ion.ucl.ac.uk

Magnetic Resonance Imaging
|January 15, 1999
PubMed
Summary

Diffusion MRI quantifies hippocampal changes in epilepsy. Sclerotic hippocampi show increased diffusion and reduced anisotropy, indicating structural loss and extracellular space expansion.

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Area of Science:

  • Neuroimaging
  • Epilepsy Research
  • Diffusion Tensor Imaging

Background:

  • The hippocampus is crucial in complex partial seizures.
  • Hippocampal sclerosis (HS) is a frequent abnormality in refractory epilepsy.

Purpose of the Study:

  • To quantify diffusion changes in the hippocampus of epilepsy patients.
  • To evaluate diffusion alterations associated with hippocampal sclerosis.

Main Methods:

  • Utilized a 1.5T MRI scanner with a cardiac-gated, navigated spin-echo diffusion-weighted sequence.
  • Acquired diffusion data in three orthogonal directions (x, y, z).
  • Calculated mean apparent diffusion coefficient (ADCav) and anisotropy index (AI) for hippocampal regions.

Main Results:

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  • Hippocampi meeting MR criteria for HS exhibited significantly higher ADCav (p < 0.001).
  • Sclerotic hippocampi demonstrated a lower AI (p=0.04) compared to normal hippocampi.
  • Findings suggest loss of structural organization and extracellular space expansion in HS.

Conclusions:

  • Quantitative diffusion measurements serve as an independent parameter for identifying abnormal hippocampi.
  • Diffusion MRI can aid in the characterization of hippocampal abnormalities in epilepsy.
  • These findings enhance understanding of the structural basis of HS in epilepsy.