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White matter changes measured by multi-component MR Fingerprinting in multiple sclerosis.

Martijn A Nagtegaal1, Ingo Hermann2, Sebastian Weingärtner3

  • 1Department of Imaging Physics, Delft University of Technology, Delft, the Netherlands; C.J. Gorter MRI Center, Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands.

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New MRI methods reveal widespread white matter changes in multiple sclerosis (MS) patients. Multi-component MR Fingerprinting (MC-MRF) detects more extensive tissue damage than conventional scans, offering better quantification of MS progression.

Keywords:
MR FingerprintingMulti-component analysisMultiple SclerosisQuantitative MRIWhite matter damage

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Area of Science:

  • Radiology and Imaging
  • Neuroscience
  • Medical Physics

Background:

  • Multiple sclerosis (MS) is characterized by T2-hyperintense lesions, but surrounding white matter is also affected.
  • Conventional MRI often underestimates the full extent of white matter damage in MS.

Purpose of the Study:

  • To develop and validate a novel quantitative MRI method to visualize and measure white matter tissue changes in MS.
  • To compare the extent of these changes with conventional FLAIR MRI findings.

Main Methods:

  • Employed a fast, multi-parametric quantitative MRI approach using multi-component MR Fingerprinting (MC-MRF).
  • Analyzed MRF scans using joint-sparsity multi-component analysis to obtain magnetization fraction maps.
  • Assessed differences in a component with prolonged relaxation times between MS patients and controls.

Main Results:

  • Identified an additional MRF component with increased transverse relaxation times in MS patients, likely representing altered free water content.
  • MS patients showed a significantly higher volume of this prolonged relaxation time component in white matter compared to healthy controls.
  • This MRF component moderately correlated with FLAIR-identified white matter damage and was more extensive in 73% of MS patients.

Conclusions:

  • The developed MC-MRF method effectively captures white matter tissue changes in MS patients.
  • This quantitative approach reveals more extensive white matter damage than visually detectable on conventional FLAIR MRI.
  • MC-MRF offers a novel and more comprehensive way to quantify white matter pathology in MS.