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MR imaging with hyperpolarized 3He gas

H Middleton1, R D Black, B Saam

  • 1Department of Physics, Princeton University, NJ 08544-0708, USA.

Magnetic Resonance in Medicine
|February 1, 1995
PubMed
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Researchers created magnetic resonance images of guinea pig lungs using hyperpolarized helium. This novel approach shows promise for future in vivo lung imaging despite current limitations in fine structural detail.

Area of Science:

  • Medical Imaging
  • Pulmonology
  • Biophysics

Background:

  • Magnetic Resonance Imaging (MRI) traditionally struggles with imaging the lungs due to their low proton density and motion artifacts.
  • Hyperpolarized gases offer a way to enhance the MR signal in normally signal-deficient lung tissues.
  • Previous research has explored various methods for gas polarization and delivery for lung MRI.

Purpose of the Study:

  • To demonstrate the feasibility of producing magnetic resonance images of guinea pig lungs using hyperpolarized helium.
  • To evaluate the potential of this technique for future in vivo lung imaging applications.
  • To discuss the unique considerations for performing MRI with hyperpolarized noble gases.

Main Methods:

  • Utilized hyperpolarized helium (He-3) as the MR contrast agent.

Related Experiment Videos

  • Employed fast 2D and 3D Gradient Recalled Echo Acquisition with Steady-State (GRASS) sequences.
  • Implemented very small flip angles to conserve longitudinal magnetization during imaging.

    • Main Results:

    • Successfully generated magnetic resonance images of guinea pig lungs.
    • Observed a strong MR signal from the lung tissue, overcoming the typical signal deficiency.
    • Images, while not yet showing fine structural detail, indicate significant potential for advanced imaging.

    Conclusions:

    • Hyperpolarized helium MRI is a promising technique for in vivo lung imaging.
    • Further optimization is needed to resolve fine structural details within the lung.
    • The choice of noble gas, polarization method, and pulse sequence are critical factors for successful hyperpolarized gas MRI.