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Detecting multiple sclerosis (MS) cortical demyelination is challenging. New MRI T1w/T2w ratio maps show promise for assessing myelin loss in the brain cortex, aiding MS diagnosis.

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Area of Science:

  • Neuroimaging
  • Neuropathology
  • Magnetic Resonance Imaging

Background:

  • Cortical demyelination detection in multiple sclerosis (MS) is clinically challenging.
  • Magnetic resonance imaging (MRI) T1-weighted (T1w) and T2-weighted (T2w) image ratios may indicate cortical myelin levels.
  • Current methods for assessing cortical myelin status in MS are limited.

Purpose of the Study:

  • To evaluate the utility of T1w/T2w ratio maps for detecting cortical demyelination in multiple sclerosis (MS).
  • To correlate MRI-derived T1w/T2w measures with histological myelin status in postmortem MS brains.

Main Methods:

  • Acquisition of in situ postmortem MRI scans (3T) from 6 human cadavers with MS.
  • Utilized immunocytochemistry to determine myelin status in cortical tissue.
  • Calculated T1w/T2w ratio maps from MRI data for correlation analysis.

Main Results:

  • T1w/T2w values showed significant differences between demyelinated and myelinated cortical regions (p < 0.001).
  • Demonstrated a strong correlation between MRI T1w/T2w ratios and histological myelin assessment.
  • The T1w/T2w ratio maps proved sensitive to variations in cortical myelin content.

Conclusions:

  • T1w/T2w ratio mapping is a potentially simple and clinically feasible MRI technique for assessing cortical demyelination in MS.
  • This method offers a promising non-invasive approach to evaluate myelin integrity in the MS cortex.
  • Further validation in clinical settings is warranted to confirm diagnostic utility.