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Metabolite concentrations in the developing brain estimated with proton MR spectroscopy
Author(s) -
Toft Peter B.,
Leth Helle,
Lou Hans C.,
Pryds Ole,
Henriksen Ole
Publication year - 1994
Publication title -
journal of magnetic resonance imaging
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.563
H-Index - 160
eISSN - 1522-2586
pISSN - 1053-1807
DOI - 10.1002/jmri.1880040510
Subject(s) - phosphocreatine , creatine , choline , metabolite , phosphomonoesters , glutamate receptor , chemistry , proton magnetic resonance , nuclear magnetic resonance , nuclear magnetic resonance spectroscopy , spectroscopy , proton , endocrinology , medicine , biochemistry , energy metabolism , physics , receptor , quantum mechanics
The purpose of the present study was to estimate absolute concentrations and relaxation time constants of metabolites that were detectable with proton magnetic resonance (MR) spectroscopy in the healthy preterm, term, and infant brain. Five MR spectra were recorded for each infant by using STEAM (stimulated‐echo acquisition mode) sequences with different TEs and TRs. Water was used as an internal standard. The T1 of choline‐containing compounds (Cho) and the T1 of phosphocreatine plus creatine (PCr+Cr) decreased. The T2 of the N ‐acetyl‐L‐aspartate (NAA) resonance increased, probably because of a relatively larger signal overlap with glutamate in the most immature brains. The concentration of NAA almost doubled, whereas the Cho concentration showed only a nonsignificant tendency to decrease; therefore, the well‐known increase in the ratio of NAA to Cho appears to be due mostly to an increase in NAA concentration. The concentration of PCr+Cr increased rapidly and reached adolescent values at approximately 4 months of age.