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Updated: Apr 21, 2026

Hyperpolarized Xenon for NMR and MRI Applications
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Biomedical imaging with hyperpolarized noble gases.

Kai Ruppert

    Reports on Progress in Physics. Physical Society (Great Britain)
    |November 1, 2014
    PubMed
    Summary

    Hyperpolarized noble gases (HNGs) dramatically enhance magnetic resonance (MR) imaging signals, enabling detailed visualization of lung air spaces. This technique offers new insights into lung structure and function, surpassing conventional proton MR imaging limitations.

    Area of Science:

    • Medical Imaging
    • Biophysics
    • Pulmonary Medicine

    Background:

    • Conventional proton MR imaging struggles to visualize air-filled spaces like the lung due to low signal.
    • Hyperpolarized noble gases (HNGs) offer significantly higher signal-to-noise ratios compared to thermal equilibrium.
    • This enhancement allows for unprecedented imaging of porous structures and air cavities.

    Purpose of the Study:

    • To review the principles and applications of HNG MR imaging.
    • To highlight the differences between HNG and conventional proton MR imaging.
    • To explore current and future HNG imaging techniques for lung assessment.

    Main Methods:

    • Utilizing hyperpolarized noble gases (e.g., Helium-3, Xenon-129) for MR imaging.
    • Modifying MR pulse sequences to optimize gas signal acquisition.

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  • Comparing HNG MR imaging with conventional proton MR imaging.

    • Main Results:

    • HNG MR imaging provides signal enhancements of approximately 100,000 times over thermal equilibrium.
    • Air spaces, typically signal voids, become clearly visible for structural and functional analysis.
    • HNG MR imaging reveals previously inaccessible information about human and animal lungs.

    Conclusions:

    • HNG MR imaging represents a significant advancement in visualizing lung air spaces.
    • The technique offers superior structural and functional assessment capabilities compared to conventional MR.
    • Future applications hold promise for diagnosing and monitoring various lung diseases.