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MRI using hyperpolarized noble gases

H Kauczor1, R Surkau, T Roberts

  • 1Department of Radiology, Johannes Gutenberg University Mainz, Langenbeckstrasse 1, D-55 131 Mainz, Germany.

European Radiology
|June 24, 1998
PubMed
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Hyperpolarized noble gases like Helium-3 and Xenon-129 offer a revolutionary approach to MRI, enabling detailed imaging of lung ventilation and cerebral perfusion with enhanced sensitivity and speed.

Area of Science:

  • Medical Physics
  • Nuclear Magnetic Resonance Imaging
  • Gas Phase Chemistry

Background:

  • Noble gases (Helium-3, Xenon-129) possess nuclear spin properties suitable for magnetic resonance.
  • Optical pumping techniques enable hyperpolarization, creating non-equilibrium spin states.
  • Hyperpolarization significantly amplifies the MRI signal from low-density gases.

Purpose of the Study:

  • To review the physical principles behind MRI with hyperpolarized noble gases.
  • To survey current preclinical and clinical applications of this technology.
  • To highlight the potential of hyperpolarized gas MRI in medical diagnostics.

Main Methods:

  • Optical pumping for hyperpolarization via spin exchange or metastability exchange.
  • Utilizing broadband RF systems and dedicated coils for MR acquisition.

Related Experiment Videos

  • Administering hyperpolarized gases as inhalative contrast agents.
  • Employing fast, low-flip-angle pulse sequences for dynamic imaging.

    • Main Results:

    • Hyperpolarization increases signal by five orders of magnitude, compensating for low gas density.
    • Stored polarization allows for transport and application (3 hours to 6 days).
    • Hyperpolarized gas MRI enables imaging of lung airways/airspaces and shows potential for cerebral perfusion and white matter disease.
    • No adverse effects observed in volunteers or patients, apart from xenon's anesthetic properties.

    Conclusions:

    • Hyperpolarized noble gas MRI is a promising, emerging technique with significant potential.
    • It offers unique capabilities for functional imaging of pulmonary ventilation and cerebral perfusion.
    • Further development presents opportunities for the MR community in medical imaging.