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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
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Measuring temperature in polyvinylpyrrolidone (PVP) solutions using MR spectroscopy.

Neville D Gai1, Ruifeng Dong1, Jan Willem van der Veen2

  • 1Laboratory on Quantitative Medical Imaging, NIBIB/NIH, Bethesda, Maryland, USA.

Medical Physics
|February 17, 2025
PubMed
Summary

Polyvinylpyrrolidone (PVP) solutions can be used to accurately measure temperature using Magnetic Resonance (MR) spectroscopy. This method is reliable for calibrating diffusion MRI measurements across different MRI scanners.

Keywords:
PVP phantomPVP spectroscopypolyvinylpyrrolidonetemperature mapping

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Area of Science:

  • Magnetic Resonance Imaging
  • Biomedical Engineering
  • Materials Science

Background:

  • Polyvinylpyrrolidone (PVP) water solutions are valuable for validating diffusion measurements across sites and vendors.
  • Accurate temperature determination is crucial as water diffusivity is temperature-dependent.

Purpose of the Study:

  • Investigate the use of MR spectroscopy (MRS) for absolute temperature measurements in PVP solutions.
  • Assess the reproducibility and repeatability of temperature measurements across three different MRI scanner vendors.

Main Methods:

  • Utilized a 40% PVP w/w solution in a spherical container.
  • Employed a Point Resolved Spectroscopy (PRESS) sequence with water suppression on 3T scanners (GE, Siemens, Philips).
  • Mapped the frequency shift of a specific PVP methylene proton peak against temperatures measured by a fiber optic probe.

Main Results:

  • Identified stable proton peaks in PVP solutions, with the water peak shifting by ~-0.01 ppm/°C relative to a methylene peak.
  • Demonstrated excellent repeatability (std range: 0.00-0.14°C) and reproducibility (mean difference: 0.1-0.4°C) across scanners.
  • MRS-derived temperatures showed good agreement with probe measurements for in-house phantoms, with variations for commercial phantoms.

Conclusions:

  • PVP solutions possess stable proton peaks suitable for temperature assessment via MR proton spectroscopy.
  • MRS-based temperature measurements are fast, feasible with standard sequences, and essential for calibrating diffusion MRI.
  • This technique provides fundamental data for cross-vendor validation of diffusion measurements.