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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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Published on: July 28, 2013

Diffusion tensor MRI tractography and cognitive impairment in multiple sclerosis.

S Mesaros1, M A Rocca, K Kacar

  • 1Neuroimaging Research Unit, Institute of Experimental Neurology, Division of Neuroscience, Scientific Institute and University Vita-Salute San Raffaele, Milan, Italy. m.filippi@hsr.it

Neurology
|March 2, 2012
PubMed
Summary

Cognitive impairment in multiple sclerosis (MS) is linked to damage in specific brain white matter (WM) tracts. Lesions in these critical pathways, rather than widespread damage, best predict cognitive dysfunction in MS patients.

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Published on: July 28, 2013

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Area of Science:

  • Neuroimaging
  • Neurology
  • Cognitive Neuroscience

Background:

  • Multiple sclerosis (MS) is a demyelinating disease affecting the central nervous system (CNS).
  • Cognitive impairment is a common and disabling symptom in MS patients.
  • The relationship between specific patterns of CNS damage and cognitive dysfunction in MS requires further elucidation.

Purpose of the Study:

  • To investigate the correlation between cognitive impairment and both global and regional CNS damage in MS.
  • To quantify CNS damage using conventional and diffusion tensor (DT) MRI tractography.
  • To determine the predictive value of different MRI measures for cognitive impairment in MS.

Main Methods:

  • Acquired brain MRI data (dual-echo, T1-weighted, DT MRI) from 82 MS patients.
  • Utilized DT tractography to map white matter (WM) tracts associated with cognition.
  • Employed random forest (RF) analysis to assess the contribution of global and regional brain damage to cognitive impairment.

Main Results:

  • Thirty-three patients exhibited cognitive impairment; most MRI measures differed significantly between impaired and cognitively preserved groups.
  • Significant correlations (r from -0.60 to 0.57) were observed between neuropsychological test performance and global/regional brain damage.
  • RF analysis achieved high accuracy (C-index 76.8%) in classifying cognitively impaired vs. preserved patients, with lesional damage in cognitive tracts showing the highest predictive power.

Conclusions:

  • Lesions within strategically important brain WM tracts are key contributors to cognitive impairment in MS.
  • MS-related cognitive dysfunction arises from a multisystem disconnection syndrome.
  • Targeting specific WM tract lesions may be crucial for managing cognitive deficits in MS.