Proton MR spectroscopy and magnetization transfer ratio in multiple sclerosis: Correlative findings of active versus irreversible plaque disease

Hirohiko Kimura, Robert I. Grossman, Robert E. Lenkinski, Francisco Gonzalez-Scarano

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Abstract

PURPOSE: To characterize plaques of multiple sclerosis (MS) using both proton MR spectroscopy and magnetization transfer (MT) imaging. METHODS: The magnetization transfer ratio (MTR) was calculated from two series of three- dimensional gradient-recalled acquisition in the steady state (GRASS) images obtained with and without an MT saturation pulse. Proton spectra were acquired using the point-resolved spectroscopy (PRESS) sequence with a voxel size of 1.5 x 1.5 x 1.5 cm 3. A total of 28 spectra were obtained in 13 patients who had clinically definitive MS. The spectra were analyzed together with the MTR. RESULTS: A positive relationship was found between the N- acetylaspartate (NAA)/creatine (Cr) ratio and the MTR in MS plaques, whereas no significant correlation was found between the metabolite ratios and the signal intensity on fast spin-echo T2-weighted MR images. CONCLUSION: Small changes in the MTR of MS plaques relative to the MTR of normal white matter may reflect inflammatory changes and edema, whereas larger changes in MTR correlate with decreased NAA/Cr ratio and therefore suggest demyelination and irreversible damage from chronic MS plaques.

Original languageEnglish (US)
Pages (from-to)1539-1547
Number of pages9
JournalAmerican Journal of Neuroradiology
Volume17
Issue number8
StatePublished - Sep 1 1996

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Keywords

  • Magnetic resonance, magnetization transfer
  • Magnetic resonance, spectroscopy
  • Sclerosis, multiple

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Clinical Neurology

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