Diffusion of myelin water

Trevor J. Andrews, Michael T. Osborne, Mark D. Does

Research output: Contribution to journalArticle

29 Scopus citations

Abstract

We studied compartmentally specific characteristics of water diffusion in excised frog sciatic nerve by combining T1 or T2 selective acquisitions with pulse-gradient spin-echo (PGSE) diffusion weighting, with the specific objective of characterizing myelin water diffusion. Combining a PGSE with a Carr-Purcell-Meiboom-Gill (CPMG) acquisition provided apparent diffusion coefficients (ADCs) for each of the three T2 components found in nerve, including the short-lived component believed to be derived from myelin water. Double-inversion-recovery (DIR) preparation provided an alternate means of discriminating myelin water, and in combination with PGSE provided somewhat different measures of ADC. The DIR measures yielded myelin water ADCs of 0.37 μm2/ms (parallel to nerve) and 0.13 μm2/ms (perpendicular to nerve). These ADC estimates were postulated to be more accurate than those based on T2 discrimination, although the difference between the two findings is not clear.

Original languageEnglish
Pages (from-to)381-385
Number of pages5
JournalMagnetic resonance in medicine
Volume56
Issue number2
DOIs
StatePublished - Aug 1 2006
Externally publishedYes

Keywords

  • Diffusion
  • MRI
  • Myelin
  • T
  • T

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