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Homonuclear correlation spectroscopy (COSY) is a powerful technique used in Nuclear Magnetic Resonance (NMR) spectroscopy to study the correlations between nuclei of the same type within a molecule. It provides information about scalar couplings between adjacent nuclei, which helps determine connectivity and structural information. There are several COSY variants, each with its unique strengths and experimental parameters.
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Hyperpolarized 13C Metabolic Magnetic Resonance Spectroscopy and Imaging
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Single voxel localization for dynamic hyperpolarized (13)C MR spectroscopy.

Albert P Chen1, Charles H Cunningham2

  • 1GE Healthcare, Toronto, ON, Canada.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|August 2, 2015
PubMed
Summary

This study introduces a novel PRESS pulse sequence for hyperpolarized carbon-13 magnetic resonance spectroscopy (MRS). The new method enhances metabolite signal-to-noise ratio (SNR) by preventing saturation of the hyperpolarized substrate.

Keywords:
(13)C MRSDNPPRESSRefocusing RF pulseSpectral–spatialVolume localization

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Area of Science:

  • Magnetic Resonance Spectroscopy (MRS)
  • Hyperpolarized Carbon-13 Imaging
  • Metabolic Imaging

Background:

  • Proton Magnetic Resonance Spectroscopy (1H MRS) commonly uses the PRESS technique for voxel localization.
  • Dynamic hyperpolarized 13C MRS experiments face challenges with refocusing pulse saturation of pre-polarized substrate spins.
  • This saturation limits metabolite signal detection in hyperpolarized 13C MRS.

Purpose of the Study:

  • To develop and evaluate a modified PRESS pulse sequence for hyperpolarized 13C MRS.
  • To overcome the limitation of substrate spin saturation caused by conventional refocusing pulses.
  • To improve metabolite signal-to-noise ratio (SNR) in dynamic hyperpolarized 13C MRS.

Main Methods:

  • Implementation of a PRESS pulse sequence with spectral-spatial refocusing pulses.
  • Incorporation of a 'notch' in the refocusing pulses to avoid perturbing the substrate resonance.
  • In vivo testing using hyperpolarized [1-(13)C]pyruvate in a dynamic hyperpolarized 13C MRS setup.

Main Results:

  • The modified PRESS sequence successfully avoided saturation of the hyperpolarized substrate spins.
  • Experiments using spectral-spatial refocusing pulses demonstrated higher metabolite SNR.
  • Compared to conventional refocusing pulses, the new method yielded improved signal detection.

Conclusions:

  • The developed spectral-spatial refocusing pulses in the PRESS sequence are effective for hyperpolarized 13C MRS.
  • This technique enhances metabolite SNR by selectively refocusing metabolic product spins.
  • The findings offer a promising advancement for in vivo metabolic imaging with hyperpolarized 13C MRS.