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Optically transmitted and inductively coupled electric reference to access in vivo concentrations for quantitative proton‐decoupled 13 C magnetic resonance spectroscopy
Author(s) -
Chen Xing,
Pavan Matteo,
HeinzerSchweizer Susanne,
Boesiger Peter,
Henning Anke
Publication year - 2012
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.23110
Subject(s) - nuclear magnetic resonance , nuclear magnetic resonance spectroscopy , spectroscopy , chemistry , nuclear overhauser effect , creatine , in vivo , metabolite , analytical chemistry (journal) , proton , chromatography , physics , biochemistry , microbiology and biotechnology , quantum mechanics , biology
This report describes our efforts on quantification of tissue metabolite concentrations in m M by nuclear Overhauser enhanced and proton decoupled 13 C magnetic resonance spectroscopy and the Electric Reference To access In vivo Concentrations (ERETIC) method. Previous work showed that a calibrated synthetic magnetic resonance spectroscopy‐like signal transmitted through an optical fiber and inductively coupled into a transmit/receive coil represents a reliable reference standard for in vivo 1 H magnetic resonance spectroscopy quantification on a clinical platform. In this work, we introduce a related implementation that enables simultaneous proton decoupling and ERETIC‐based metabolite quantification and hence extends the applicability of the ERETIC method to nuclear Overhauser enhanced and proton decoupled in vivo 13 C magnetic resonance spectroscopy. In addition, ERETIC signal stability under the influence of simultaneous proton decoupling is investigated. The proposed quantification method was cross‐validated against internal and external reference standards on human skeletal muscle. The ERETIC signal intensity stability was 100.65 ± 4.18% over 3 months including measurements with and without proton decoupling. Glycogen and unsaturated fatty acid concentrations measured with the ERETIC method were in excellent agreement with internal creatine and external phantom reference methods, showing a difference of 1.85 ± 1.21% for glycogen and 1.84 ± 1.00% for unsaturated fatty acid between ERETIC and creatine‐based quantification, whereas the deviations between external reference and creatine‐based quantification are 6.95 ± 9.52% and 3.19 ± 2.60%, respectively. Magn Reson Med, 2011. © 2011 Wiley Periodicals, Inc.