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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
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NMR Spectrometers: Resolution and Error Correction01:14

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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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MR Spectroscopy Without Water Suppression Using the Gradient Impulse Response Function.

James B Bacon1, Peter Jezzard1, William T Clarke1

  • 1Oxford Centre for Integrative Neuroimaging (OxCIN), FMRIB, Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, UK.

Magnetic Resonance in Medicine
|May 6, 2026
PubMed
Summary
This summary is machine-generated.

Gradient Impulse Response Function (GIRF) correction effectively removes artifactual sidebands in non-water-suppressed proton magnetic resonance spectroscopy (1H-MRS). This method enables accurate metabolite quantification without compromising spectral quality.

Keywords:
MR spectroscopygradient impulse response functionsingle voxel spectroscopysystem imperfections: measurement and correctionwater suppression

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Area of Science:

  • Magnetic Resonance Imaging and Spectroscopy
  • Biomedical Engineering
  • Neuroimaging

Background:

  • Non-water-suppressed 1H-MRS offers advantages like automated data correction and reduced RF power deposition.
  • However, eddy current-induced sidebands on the water resonance typically necessitate water suppression.
  • Water suppression can introduce magnetization transfer effects and obscure metabolite signals.

Purpose of the Study:

  • To evaluate the efficacy of Gradient Impulse Response Function (GIRF) correction for mitigating artifactual sidebands in non-water-suppressed 1H-MRS.
  • To compare GIRF-corrected non-water-suppressed acquisitions with standard water-suppressed acquisitions.
  • To assess the impact of GIRF correction on metabolite quantification.

Main Methods:

  • The Gradient Impulse Response Function (GIRF) was calibrated once to predict magnetic field perturbations.
  • GIRF predictions were used for post-processing correction of sidebands in non-water-suppressed single-voxel-spectroscopy (SVS).
  • Acquisitions were performed at 3T using semi-LASER and MEGA-PRESS sequences in eight participants.

Main Results:

  • GIRF correction successfully reduced sideband amplitudes, comparable to the spectral baseline.
  • Metabolite signal recovery was achieved, enabling accurate quantification.
  • Systematic increases in metabolite concentrations were observed in GIRF-corrected data compared to water-suppressed data, attributed to reduced magnetization transfer.

Conclusions:

  • GIRF-based correction is an effective method to address gradient-induced sidebands in non-water-suppressed 1H-MRS.
  • This approach facilitates improved metabolite quantification by retaining the water signal.
  • The GIRF method is adaptable to other SVS sequences and magnetic field strengths after calibration.