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Related Experiment Videos

Age-related alterations in white matter microstructure measured by diffusion tensor imaging.

D H Salat1, D S Tuch, D N Greve

  • 1MGH/MIT/HMS Athinoula A. Martinos Center for Biomedical Imaging, Charlestown, MA 02129-2060, USA. salat@nmr.mgh.harvard.edu

Neurobiology of Aging
|May 27, 2005
PubMed
Summary

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Aging causes brain white matter (WM) degeneration, particularly in frontal regions and the internal capsule. Diffusion tensor imaging reveals specific fiber tracts are more vulnerable to these age-related changes.

Area of Science:

  • Neuroscience
  • Neuroimaging
  • Aging Research

Background:

  • Normal aging is associated with cerebral white matter (WM) degeneration.
  • This degeneration includes myelin density reduction and structural alterations.
  • Understanding regional vulnerability in WM is crucial for aging research.

Purpose of the Study:

  • To investigate age-related changes in cerebral white matter microstructure.
  • To identify specific white matter fiber systems preferentially vulnerable to degeneration.
  • To map the spatial distribution of age-related white matter alterations.

Main Methods:

  • Acquisition of whole-head, high-resolution diffusion tensor images (DTI) in 38 adult participants.
  • Calculation of fractional anisotropy (FA) maps to assess WM microstructure.

Related Experiment Videos

  • Estimation of regional FA measures in predefined regions of interest, including the corpus callosum (CC).

    • Main Results:

    • Significant age-related decline in FA was observed in frontal WM.
    • The posterior limb of the internal capsule (PLIC) and the genu of the CC also showed significant FA decline.
    • Temporal and posterior WM regions were relatively preserved, indicating variable degeneration patterns.

    Conclusions:

    • Cerebral white matter degeneration with aging is not uniform across the brain.
    • Specific fiber populations in the prefrontal region and PLIC are most susceptible to age-related degeneration.
    • These findings highlight regional differences in white matter vulnerability during the aging process.