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Diffusion‐weighted J‐resolved spectroscopy
Author(s) -
Landheer Karl,
Schulte Rolf,
Geraghty Ben,
Hanstock Christopher,
Chen Albert P.,
Cunningham Charles H.,
Graham Simon J.
Publication year - 2017
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.26514
Subject(s) - glutamine , metabolite , chemistry , nuclear magnetic resonance , in vivo magnetic resonance spectroscopy , nuclear magnetic resonance spectroscopy , inositol , diffusion mri , creatine , spectroscopy , magnetic resonance imaging , physics , biochemistry , amino acid , medicine , receptor , quantum mechanics , radiology
Purpose To develop a novel diffusion‐weighted magnetic resonance spectroscopy (DW‐MRS) technique in conjunction with J‐resolved spatially localized spectroscopy (JPRESS) to measure the apparent diffusion coefficients (ADCs) of brain metabolites beyond N ‐acetylaspartic acid (NAA), creatine (Cr), and choline (Cho) at 3T. This technique will be useful to probe tissue microstructures in vivo, as the various metabolites have different physiological characteristics. Methods Two JPRESS spectra were collected (high b‐value and low b‐value), and the ADCs of 16 different metabolites were estimated. Two analysis pipelines were developed: 1) a 2D pipeline that uses ProFit software to extract ADCs from metabolites not typically accessible at 3T and 2) a 1D pipeline that uses TARQUIN software to extract the metabolite concentrations from each line in the 2D dataset, allowing for scaling as well as validation. Results The ADCs of 16 different metabolites were estimated from within six subjects in parietal white matter. There was excellent agreement between the results obtained from the 1D and 2D pipelines for NAA, Cr, and Cho. Conclusion The proposed technique provided consistent estimates for the ADCs of NAA, Cr, Cho, glutamate + glutamine, and myo‐inositol in all subjects and additionally glutathione and scyllo‐inositol in all but one subject. Magn Reson Med 78:1235–1245, 2017. © 2016 International Society for Magnetic Resonance in Medicine.