Rev Neurol France
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Magnetic resonance imaging represents voxels (volume elements) of the body placed in a magnet, by their magnetization determined under various acquisition conditions weighting the contrast of the image by the density of free water protons and their relaxation times T1 and T2. Thus, the sensitivity in depicting lesions is high but pathological specificity is poor. Efforts are made to increase the diagnosis powerfulness of M. ⋯ R. diffusion imaging and functional M. R. I. are intensively under investigation for a better analysis of these different factors conditioning the reversibility of the patient disability.