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Procedure for quantitative 1 H magnetic resonance spectroscopy and tissue characterization of human brain tissue based on the use of quantitative magnetic resonance imaging
Author(s) -
Tisell A.,
Leinhard O. Dahlqvist,
Warntjes J. B. M.,
Lundberg P.
Publication year - 2013
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.24554
Subject(s) - magnetic resonance imaging , nuclear magnetic resonance spectroscopy , creatine , nuclear magnetic resonance , white matter , metabolite , chemistry , in vivo magnetic resonance spectroscopy , spectroscopy , quantitative analysis (chemistry) , medicine , physics , biochemistry , radiology , chromatography , quantum mechanics
Purpose Existing methods for quantitative magnetic resonance spectroscopy are not widely used for magnetic resonance spectroscopy examinations in clinical practice due to the lengthy and difficult workflow. In this report, we aimed to investigate whether metabolite concentrations show co‐variation with relaxation parameters ( R 1,H2O , R 2,H2O ), water concentration (Ĉ H2O ), and age, using a quantitative magnetic resonance spectroscopy method, which is suitable for a clinical setting. Methods We performed 166 single voxel magnetic resonance spectroscopy measurements in the white matter and thalamus in 47 healthy subjects, aged 18–72 years. Whole brain R 1,H2O , R 2,H2O , and Ĉ H2O maps were determined for each subject using quantitative magnetic resonance imaging. Absolute metabolite concentrations were calculated by calibrating the water‐scaled magnetic resonance spectroscopy, using the quantitative magnetic resonance imaging maps of R 1,H2O , R 2,H2O , and Ĉ H2O . Results Absolute concentrations in white matter of total Creatine and myo ‐Inositol were correlated with age (total Creatine: 12 ± 4 μM/year, P < 0.01; myo ‐Inositol: 23 ± 9 μM/year, P < 0.05), suggesting a process of increased glia density in aging white matter. Moreover, total Creatine and total N ‐acetylaspartate were inversely correlated with the R 1,H2O and positively correlated with the Ĉ H2O of white matter. In addition, the Cramér‐Rao lower bound was biased regarding the metabolite concentration, suggesting that should not be used as a quality assessment. Conclusion The implemented method was fast, robust, and user‐independent. Magn Reson Med, 70:905–915, 2013. © 2012 Wiley Periodicals, Inc.