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NMR Biomed. 2018 Sep;31(9):e3949. doi: 10.1002/nbm.3949. Epub 2018 Jul 9.

Elliptical localization with pulsed second-order fields (ECLIPSE) for robust lipid suppression in proton MRSI.

Author information

1
Department of Radiology and Biomedical Imaging, Magnetic Resonance Research Center, Yale University School of Medicine, New Haven, CT, USA.
2
Department of Biomedical Engineering, Magnetic Resonance Research Center, Yale University School of Medicine, New Haven, CT, USA.

Abstract

Proton MRSI has great clinical potential for metabolic mapping of the healthy and pathological human brain. Unfortunately, the promise has not yet been fully achieved due to numerous technical challenges related to insufficient spectral quality caused by magnetic field inhomogeneity, insufficient RF transmit power and incomplete lipid suppression. Here a robust, novel method for lipid suppression in 1 H MRSI is presented. The method is based on 2D spatial localization of an elliptical region of interest using pulsed second-order spherical harmonic (SH) magnetic fields. A dedicated, high-amplitude second-order SH gradient setup was designed and constructed, containing coils to generate Z2, X2Y2 and XY magnetic fields. Simulations and phantom MRI results are used to demonstrate the principles of the method and illustrate the manifestation of chemical shift displacement. 1 H MRSI on human brain in vivo demonstrates high quality, robust suppression of extracranial lipids. The method allows a wide range of inner or outer volume selection or suppression and should find application in MRSI, reduced-field-of-view MRI and single-volume MRS.

KEYWORDS:

human brain; lipid suppression; proton MRSI; second-order magnetic fields

PMID:
29985532
PMCID:
PMC6108906
[Available on 2019-09-01]
DOI:
10.1002/nbm.3949
[Indexed for MEDLINE]

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