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Effect of J‐coupling on lipid composition determination with localized proton magnetic resonance spectroscopy at 9.4 T
Author(s) -
Yahya Atiyah,
Tessier Anthony G.,
Fallone B. Gino
Publication year - 2011
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.22792
Subject(s) - nuclear magnetic resonance , spectral line , chemistry , nuclear magnetic resonance spectroscopy , proton , coupling (piping) , spectroscopy , composition (language) , resonance (particle physics) , proton magnetic resonance , analytical chemistry (journal) , pulse sequence , materials science , physics , atomic physics , chromatography , linguistics , philosophy , quantum mechanics , astronomy , metallurgy
Purpose: To demonstrate, at 9.4 T, that J‐coupling interactions exhibited by lipid protons affects lipid composition determination with a point resolved spectroscopy (PRESS) sequence. Materials and Methods: Experiments were conducted on four oils (almond, corn, sesame, and sunflower), on visceral adipose tissue of a euthanized mouse, and on pure linoleic acid at 9.4 T. The 2.1, 2.3, and 2.8 ppm resonances were measured at multiple echo times (TEs) by a standard PRESS sequence and by a PRESS sequence consisting of narrow‐bandwidth refocusing pulses designed to rewind the J‐coupling evolution of the target peak protons in the voxel of interest. T 2 corrections were performed on both groups of data for the three peaks and lipid compositions for the oils and for the mouse tissue were determined. Lipid compositions were also calculated from a short‐TE standard PRESS spectrum. Results: A chemical analysis of the samples was not performed; however, the oil compositions calculated from resonance peaks acquired with the PRESS sequence designed to minimize J‐coupling effects, following T 2 relaxation correction, closely agreed with values in the literature, which was not the case for all of the compositions determined from the regular PRESS spectra. Conclusion: The presented work brings to attention the significance of J‐coupling effects when calculating lipid compositions from localized proton spectra. J. Magn. Reson. Imaging 2011;. © 2011 Wiley Periodicals, Inc.