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  Toward an in vivo neurochemical profile: quantification of 18 metabolites in short-echo-time 1H NMR spectra of the rat brain.

Pfeuffer, J., Tkac, I., Provencher, S., & Gruetter, R. (1999). Toward an in vivo neurochemical profile: quantification of 18 metabolites in short-echo-time 1H NMR spectra of the rat brain. Journal of Magnetic Resonance, 141(1), 104-120. doi:10.1006/jmre.1999.1895.

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Pfeuffer, J1, Author              
Tkac, I, Author
Provencher, SW, Author
Gruetter, R, Author
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1External Organizations, ou_persistent22              

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 Abstract: Localized in vivo 1H NMR spectroscopy was performed with 2-ms echo time in the rat brain at 9.4 Tesla. Frequency domain analysis with LCModel showed that the in vivo spectra can be explained by 18 metabolite model solution spectra and a highly structured background, which was attributed to macromolecule resonances with five-fold shorter in vivo T1 than metabolites. The high spectral resolution (full-width-at-half-maximum approximately 0.025 ppm) and sensitivity (signal-to-noise ratio approximately 45 from a 63 L volume, 512 scans) was used for the simultaneous measurement of the concentrations of metabolites previously difficult to quantify in 1H spectra. The strongly represented signals of N-acetylaspartate, glutamate, taurine, myo-inositol, creatine, phosphocreatine, glutamine, and lactate were quantified with Cramér-Rao lower bounds below 4. Choline groups, phosphorylethanolamine, glucose, glutathione, -aminobutyric acid, N-acetylaspartylglutamate, and alanine were below 13, whereas aspartate and scyllo-inositol were below 22. Intra-assay variation was assessed from a time series of 3-min spectra, and the coefficient of variation was similar to the calculated Cramér-Rao lower bounds. Inter-assay variation was determined from 31 pooled spectra, and the coefficient of variation for total creatine was 7. Tissue concentrations were found to be in very good agreement with neurochemical data from the literature.

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 Dates: 1999-11
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: BibTex Citekey: 3268
DOI: 10.1006/jmre.1999.1895
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Title: Journal of Magnetic Resonance
Source Genre: Journal
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Publ. Info: San Diego [etc.] : Academic Press
Pages: - Volume / Issue: 141 (1) Sequence Number: - Start / End Page: 104 - 120 Identifier: ISSN: 0022-2364
CoNE: https://pure.mpg.de/cone/journals/resource/954922651175_1