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Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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White matter asymmetry in healthy individuals: a diffusion tensor imaging study using tract-based spatial statistics.

H Takao1, N Hayashi, K Ohtomo

  • 1Department of Radiology, Graduate School of Medicine, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8655, Japan. takaoh-tky@umin.ac.jp

Neuroscience
|August 10, 2011
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This study reveals significant white matter asymmetry in healthy adults, particularly in the arcuate fasciculus and cingulum. These brain asymmetries are largely stable across aging and show minimal differences between sexes.

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Area of Science:

  • Neuroimaging
  • Human Anatomy
  • Brain Structure

Background:

  • White matter asymmetry is a known characteristic of the human brain.
  • Understanding how age and sex influence this asymmetry is crucial for interpreting neuroimaging findings.

Purpose of the Study:

  • To investigate whole-brain white matter asymmetry in healthy adults.
  • To evaluate the impact of age and sex on white matter asymmetry.

Main Methods:

  • Utilized tract-based spatial statistics (TBSS) on a large cohort of 857 healthy adults.
  • Analyzed white matter fractional anisotropy (FA) to quantify asymmetry.
  • Examined voxel-wise differences to identify specific asymmetric regions.

Main Results:

  • Identified widespread white matter fractional anisotropy (FA) asymmetries, notably in the arcuate fasciculus and cingulum.
  • Observed that age and sex had minor effects on white matter FA asymmetry compared to overall asymmetry.
  • Found no significant interaction between age and sex on white matter asymmetry.

Conclusions:

  • White matter asymmetry is a prevalent feature in healthy adults.
  • White matter asymmetry demonstrates relative stability with aging.
  • There are no substantial differences in white matter asymmetry between males and females.