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Related Experiment Video

Updated: Aug 27, 2025

Magnetic Resonance Imaging of Multiple Sclerosis at 7.0 Tesla
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Evaluating brain damage in multiple sclerosis with simultaneous multi-angular-relaxometry of tissue.

Biao Xiang1, Jie Wen1, Robert E Schmidt2

  • 1Department of Radiology, Washington University, St. Louis, Missouri, 63110, USA.

Annals of Clinical and Translational Neurology
|September 30, 2022
PubMed
Summary
This summary is machine-generated.

New Simultaneous-Multi-Angular-Relaxometry-of-Tissue (SMART) MRI can measure macromolecule proton fraction (MPF) to detect demyelination in multiple sclerosis (MS). This quantitative imaging biomarker shows potential for tracking disease progression and treatment response.

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Area of Science:

  • Neuroimaging
  • Biomarker Discovery
  • Demyelinating Diseases

Background:

  • Multiple sclerosis (MS) is a central nervous system disease characterized by myelin loss.
  • Accurate quantification of myelin is crucial for evaluating new remyelinating therapies.
  • Quantitative magnetization transfer MRI provides macromolecule proton fraction (MPF) as a myelin correlate.

Purpose of the Study:

  • To introduce Simultaneous-Multi-Angular-Relaxometry-of-Tissue (SMART) MRI as an alternative method for generating MPF.
  • To assess the utility of SMART-derived MPF as an imaging biomarker for demyelination in MS.

Main Methods:

  • SMART MRI was performed at 3T on healthy controls (HC) and MS patients (RRMS and PMS).
  • SMART-derived MPF was measured in normal-appearing gray matter (NAGM), white matter (NAWM), and demyelinating lesions.
  • MPF was correlated with clinical scores and neuropathology in a biopsied lesion.

Main Results:

  • SMART-derived MPF was lower in MS patients compared to HC in both NAGM and NAWM.
  • MPF metrics differentiated between relapsing-remitting MS (RRMS) and progressive MS (PMS) subtypes.
  • MPF correlated significantly with physical and cognitive disability scores and neuropathological findings.

Conclusions:

  • SMART-derived MPF is a sensitive imaging biomarker for demyelination in MS.
  • This metric has the potential to monitor disease progression and therapeutic effects in MS clinical trials.