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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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Neutron Spin Echo Spectroscopy as a Unique Probe for Lipid Membrane Dynamics and Membrane-Protein Interactions
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Elliptical localization with pulsed second-order fields (ECLIPSE) for robust lipid suppression in proton MRSI.

Robin A de Graaf1,2, Peter B Brown1, Henk M De Feyter1

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

NMR in Biomedicine
|July 10, 2018
PubMed
Summary

This study introduces a novel method for lipid suppression in proton magnetic resonance spectroscopic imaging (¹H MRSI), improving spectral quality for brain metabolic mapping. The technique effectively suppresses extracranial lipids, enhancing diagnostic capabilities.

Keywords:
human brainlipid suppressionproton MRSIsecond-order magnetic fields

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Area of Science:

  • Magnetic Resonance Imaging
  • Spectroscopy
  • Neuroimaging

Background:

  • Proton magnetic resonance spectroscopic imaging (¹H MRSI) offers significant clinical potential for brain metabolic mapping.
  • Technical challenges, including magnetic field inhomogeneity and lipid interference, limit its current clinical application.
  • Effective lipid suppression is crucial for improving spectral quality in ¹H MRSI.

Purpose of the Study:

  • To present a novel and robust method for lipid suppression in ¹H MRSI.
  • To overcome limitations in spectral quality caused by magnetic field inhomogeneity and lipid signals.
  • To enhance the clinical utility of ¹H MRSI for brain metabolic analysis.

Main Methods:

  • Development and implementation of a novel lipid suppression technique using pulsed second-order spherical harmonic (SH) magnetic fields.
  • Design and construction of a dedicated high-amplitude second-order SH gradient setup (Z2, X2Y2, XY coils).
  • Utilizing 2D spatial localization of an elliptical region of interest for targeted lipid suppression.

Main Results:

  • Simulations and phantom MRI results validated the method's principles and demonstrated chemical shift displacement.
  • In vivo ¹H MRSI of the human brain showed high-quality and robust suppression of extracranial lipids.
  • The method proved effective for selective inner or outer volume selection/suppression.

Conclusions:

  • The presented method offers a robust solution for lipid suppression in ¹H MRSI.
  • This technique significantly improves spectral quality, paving the way for more accurate brain metabolic mapping.
  • The method has broad applicability in ¹H MRSI, reduced-field-of-view MRI, and single-volume MRS.