Quantification of ethanol methyl 1H magnetic resonance signal intensity following intravenous ethanol administration in primate brain

Graham S. Flory, Jean O'Malley, Kathleen A. Grant, Byung Park, Christopher D. Kroenke

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

In vivo 1H magnetic resonance spectroscopy (MRS) can be used to directly monitor brain ethanol. Previously, studies of human subjects have lead to the suggestion that the ethanol methyl 1H MRS signal intensity relates to tolerance to ethanol's intoxicating effects. More recently, the ethanol 1H MRS signal intensity has been recognized to vary between brain gray matter (GM), white matter (WM), and cerebrospinal fluid (CSF) due to differences in T2 within these environments. The methods presented here extend ethanol MRS techniques to non-human primate subjects. Twelve monkeys were administered ethanol while sedated and positioned within a 3T MRI system. Chemical shift imaging (CSI) measurements were performed following intravenous infusion of 1 g/kg ethanol. Magnetic resonance imaging (MRI) data were also recorded for each monkey to provide volume fractions of GM, WM, and CSF for each CSI spectrum. To estimate co-variance of ethanol MRS intensity with GM, WM, and CSF volume fractions, the relative contribution of each tissue subtype was determined following corrections for radiofrequency pulse profile non-uniformity, chemical shift artifacts, and differences between the point spread function in the CSI data and the imaging data. The ethanol MRS intensity per unit blood ethanol concentration was found to differ between GM, WM, and CSF. Individual differences in MRS intensity were larger in GM than WM. This methodology demonstrates the feasibility of ethanol MRS experiments and analysis in non-human primate subjects, and suggests GM may be a site of significant variation in ethanol MRS intensity between individuals.

Original languageEnglish (US)
Pages (from-to)189-198
Number of pages10
JournalMethods
Volume50
Issue number3
DOIs
StatePublished - Mar 1 2010

Keywords

  • Brain
  • Ethanol
  • Magnetic resonance imaging
  • Magnetic resonance spectroscopy
  • Monkey
  • Non-human primate

ASJC Scopus subject areas

  • Molecular Biology
  • Biochemistry, Genetics and Molecular Biology(all)

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