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Related Experiment Video

Updated: Sep 29, 2025

Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
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Diffusion Tensor Imaging Revealed Microstructural Changes in Normal-Appearing White Matter Regions in

Jianfeng Bao1,2, Hui Tu1, Yijia Li1

  • 1College of Medical Technology and Engineering, Henan University of Science and Technology, Luoyang, China.

Frontiers in Neuroscience
|March 21, 2022
PubMed
Summary

Diffusion tensor imaging reveals widespread white matter microstructure changes in relapsing-remitting multiple sclerosis (RRMS) patients. These findings suggest demyelination and axonal injury in normal-appearing white matter, offering potential biomarkers for disease severity.

Keywords:
diffusion tensor imagingmagnetic resonance imagingnormal-appearing white matterprobabilistic lesion maprelapsing-remitting multiple sclerosiswhite matter tracts atlas

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Area of Science:

  • Neuroimaging
  • White Matter Integrity
  • Multiple Sclerosis Research

Background:

  • White matter (WM) integrity, comprising axons and myelin sheaths, is crucial for normal brain function.
  • Previous studies identified metabolite abnormalities in normal-appearing white matter (NAWM) of relapsing-remitting multiple sclerosis (RRMS) patients using magnetic resonance spectroscopy.
  • This study investigates the association between metabolite changes and microstructure alterations in NAWM using diffusion tensor imaging (DTI).

Purpose of the Study:

  • To assess the microstructural integrity of normal-appearing white matter (NAWM) in relapsing-remitting multiple sclerosis (RRMS) patients.
  • To identify specific diffusion tensor imaging (DTI) metrics indicative of white matter damage in RRMS.
  • To explore the potential of DTI metrics as non-invasive biomarkers for RRMS disease severity.

Main Methods:

  • Diffusion tensor imaging (DTI) scans were acquired from 17 RRMS patients and 21 healthy controls using a 3.0-T scanner.
  • Key DTI metrics including fractional anisotropy (FA), mean diffusivity (MD), axial diffusivity (AD), and radial diffusivity (RD) were calculated.
  • Regions of interest (ROIs) were defined within the white matter atlas after excluding lesion areas identified by a probabilistic lesion map.

Main Results:

  • RRMS patients exhibited significantly lower FA in the corpus callosum, anterior corona radiata, and posterior thalamic radiation.
  • Increased MD was observed in the anterior and superior corona radiata of RRMS patients.
  • Elevated AD and RD values were found across various NAWM tracts in RRMS patients, with significant differences noted in specific regions like the genu corpus callosum and posterior thalamic radiation.

Conclusions:

  • Widespread microstructural changes in NAWM of RRMS patients were detected using DTI and a WM atlas with lesion exclusion.
  • Findings support hypotheses of demyelination, inflammatory cell infiltration, and axonal injury in NAWM in RRMS.
  • DTI-derived metrics show promise as non-invasive biomarkers for assessing RRMS disease severity.