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Diffusion weighted MRI demonstrates abnormal pyramidal tract in hemiparesis
  1. UDO C WIESHMANN,
  2. MARK R SYMMS,
  3. PHILIPPA A BARTLETT,
  4. SIMON D SHORVON
  1. NSE Epilepsy Research MRI Unit, Epilepsy Research Group
  2. NMR Research Unit, Institute of Neurology, Queen Square, London WC1N3BG, UK
  1. Dr Udo C Wieshmann, NMR Research Unit, Institute of Neurology, Queen Square London WC1N3BG, UK. Telephone 00441494 874646; fax: 00441494 875666; email uwiesh{at}ion.ucl.ac.uk
  1. CHRIS A CLARK,
  2. GARETH J BARKER
  1. NSE Epilepsy Research MRI Unit, Epilepsy Research Group
  2. NMR Research Unit, Institute of Neurology, Queen Square, London WC1N3BG, UK
  1. Dr Udo C Wieshmann, NMR Research Unit, Institute of Neurology, Queen Square London WC1N3BG, UK. Telephone 00441494 874646; fax: 00441494 875666; email uwiesh{at}ion.ucl.ac.uk

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  Diffusion weighted imaging (DWI) is a magnetic resonance imaging technique which is sensitive to the molecular motion of water and allows measurements of anisotropy (the directionality) of water diffusion.1 Measurements of anisotropy provides information about tracts, because water molecules travel predominantly parallel but not perpendicular to tracts.2 The anisotropy of diffusion can be …

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