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Hyperpolarized Xenon for NMR and MRI Applications
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Portable Hyperpolarized Xe-129 Apparatus with Long-Time Stable Polarization Mediated by Adaptable Rb Vapor Density.

Robert Stäglich1, Tobias W Kemnitzer1, Marie C Harder1

  • 1Inorganic Chemistry III and Northern Bavarian NMR Centre, University of Bayreuth, Universitätsstraße 30, 95447 Bayreuth, Germany.

The Journal of Physical Chemistry. A
|April 14, 2022
PubMed
Summary

A new polarizer provides stable, hyperpolarized 129Xe for hours, improving magnetic resonance imaging and spectroscopy. This breakthrough enhances the analysis of pore spaces in materials science and life sciences applications.

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Area of Science:

  • Physics
  • Chemistry
  • Materials Science

Background:

  • Hyperpolarized 129Xe is crucial for advanced magnetic resonance imaging (MRI) and spectroscopy.
  • Current methods suffer from polarization fluctuations, limiting quantitative analysis of porous materials.

Purpose of the Study:

  • To develop a novel polarizer for hyperpolarized 129Xe with long-term stable polarization.
  • To enable reproducible and quantitative analysis of pore interconnectivity.

Main Methods:

  • A compact, transportable polarizer with a vertically oriented, two-bodied pumping cell and a separate Rb presaturation chamber.
  • Independent temperature control for the presaturation chamber to precisely manage Rb vapor density.
  • Continuous stream production of hyperpolarized 129Xe with stable polarization levels for hours.

Main Results:

  • Achieved stable 129Xe polarization levels of approximately 40% for hours.
  • Demonstrated magnetization production rates of ~70 mL/h at moderate pressures.
  • Presented time-evolved 2D exchange spectra of 129Xe in CAU-1-AmMe, showcasing quantitative capabilities.

Conclusions:

  • The developed polarizer offers unprecedented stability and quantitative performance for hyperpolarized 129Xe applications.
  • Its compact and transportable design facilitates use in diverse experimental settings.
  • Enables high-fidelity analysis of complex porous structures in various scientific fields.