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Related Experiment Videos

Exploring hyperpolarized 83Kr by remotely detected NMR relaxometry.

Zackary I Cleveland1, Galina E Pavlovskaya, Karl F Stupic

  • 1Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA.

The Journal of Chemical Physics
|February 8, 2006
PubMed
Summary

Hyperpolarized 83Kr (krypton-83) gas, the first noble gas with a nuclear electric quadrupole moment, is now available for high-field nuclear magnetic resonance (NMR) applications. This breakthrough enables significant signal enhancements for NMR spectroscopy and imaging.

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Area of Science:

  • Nuclear Magnetic Resonance Spectroscopy
  • Magnetic Resonance Imaging
  • Quantum Optics

Background:

  • Nuclear magnetic resonance (NMR) and magnetic resonance imaging (MRI) typically utilize nuclei without electric quadrupole moments.
  • Noble gases are frequently used as hyperpolarized agents in NMR and MRI.
  • The development of novel hyperpolarized agents is crucial for advancing NMR/MRI sensitivity and applications.

Purpose of the Study:

  • To introduce and characterize hyperpolarized 83Kr (krypton-83) for high-field NMR spectroscopy and MRI.
  • To investigate the generation and properties of hyperpolarized 83Kr.
  • To explore the potential of 83Kr as a contrast agent in biological systems.

Main Methods:

  • Generation of hyperpolarized 83Kr via spin-exchange optical pumping at high gas densities.

Related Experiment Videos

  • Separation of 83Kr from rubidium vapor used in optical pumping.
  • High-field (9.4 T) NMR spectroscopy and remotely detected NMR spectroscopy (0.05–3 T).
  • Measurement of spin-lattice relaxation in macroscopic glass containers and desiccated canine lung tissue.

    • Main Results:

    • Achieved signal enhancements of over three orders of magnitude for 83Kr compared to thermal equilibrium at 9.4 T.
    • Identified quadrupolar couplings during brief adsorption on container walls as the primary cause of spin-lattice relaxation.
    • Observed a dramatic acceleration of longitudinal relaxation with decreasing magnetic field strength (0.05–3 T).

    Conclusions:

    • Hyperpolarized 83Kr is a viable agent for high-field NMR spectroscopy and MRI, offering significant signal enhancement.
    • Quadrupolar relaxation mechanisms are critical for understanding and optimizing 83Kr polarization.
    • The magnetic field-dependent relaxation behavior of 83Kr necessitates careful consideration for its application in low-field NMR and MRI.