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Myelin water and tensor-valued diffusion imaging: (How) are they related?

Sharada Balaji1, Adam V Dvorak1, Neale Wiley1

  • 1Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada.

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Summary

Quantitative MRI metrics, including myelin water fraction (MWF), microscopic FA (μFA), and tissue heterogeneity (CMD), offer enhanced insights into central nervous system microstructure. These measures reveal tract-specific differences in healthy tissue and detect subtle pathological changes in multiple sclerosis.

Keywords:
b‐tensor diffusionmicroscopic fractional anisotropymyelin water imagingtensor‐valued diffusiontract profiling

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Area of Science:

  • Neuroimaging
  • Quantitative MRI
  • White Matter Microstructure

Background:

  • Conventional MRI has limitations in characterizing central nervous system tissue microstructure.
  • Quantitative MRI (qMRI) provides detailed microstructural information.
  • Multi-metric qMRI approaches can improve understanding of healthy and diseased tissues.

Purpose of the Study:

  • To investigate the relationship between myelin water fraction (MWF) and tensor-valued diffusion imaging metrics (microscopic FA - μFA, and CMD).
  • To characterize white matter microstructure in healthy individuals using these combined metrics.
  • To evaluate the utility of these multi-metric approaches in assessing pathological changes, specifically in multiple sclerosis (MS).

Main Methods:

  • Assessed relationships between MWF, FA, μFA, and CMD in 25 healthy individuals using atlas comparison, correlation, and tract profiling.
  • Applied z-score analysis and tract profiling in five individuals with MS to evaluate multi-metric utility in pathology.

Main Results:

  • Tract profiling revealed consistent, tract-specific patterns for MWF, μFA, and CMD in healthy white matter, resolving confounding factors seen in simple correlation.
  • In MS, MWF, μFA, and CMD demonstrated high sensitivity to pathology, identifying abnormalities in normal-appearing white matter and lesional areas.
  • These metrics highlighted distinct types of tissue damage in MS.

Conclusions:

  • Combining MWF, μFA, and CMD provides a powerful multi-metric approach for assessing central nervous system microstructure.
  • This approach enhances the investigation of development, aging, disease, and injury processes.
  • The study demonstrates improved characterization of both healthy and pathological white matter.