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Updated: Jul 18, 2026
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Acquiring Hyperpolarized 129Xe Magnetic Resonance Images of Lung Ventilation
Published on: November 21, 2023
Imaging alveolar-capillary gas transfer using hyperpolarized 129Xe MRI.
Bastiaan Driehuys1, Gary P Cofer, Jim Pollaro
1Center for In Vivo Microscopy, Duke University Medical Center, Durham, NC 27710, USA. bastiaan.driehuys@duke.edu
Summary
This study introduces a novel hyperpolarized (129)Xe MRI method to image gas transfer across the lung's blood-gas barrier. This technique can detect subtle changes in barrier thickness, aiding in diagnosing lung diseases.
Area of Science:
- Pulmonary Medicine
- Medical Imaging
- Biophysics
Background:
- Effective pulmonary gas exchange depends on unimpeded diffusion across the blood-gas barrier.
- Pulmonary diseases like fibrosis and edema thicken this barrier, impairing gas exchange.
- Current methods lack direct imaging of gas transfer, hindering accurate assessment.
Purpose of the Study:
- To develop and validate a novel magnetic resonance imaging (MRI) method for directly visualizing and quantifying gas transfer across the lung's blood-gas barrier.
- To assess the sensitivity of this technique to changes in blood-gas barrier thickness.
Main Methods:
- Utilized hyperpolarized (129)Xe MRI due to its unique solubility and chemical shift properties.
- Developed a method to differentially image (129)Xe transfer from airspaces into lung tissue barrier and red blood cells (RBCs).
- Employed a diffusion model to estimate blood-gas barrier thickness changes.
Main Results:
- Successfully separated MRI signals originating from the tissue barrier and RBCs.
- Demonstrated sensitivity to blood-gas barrier thickness changes of approximately 5 micrometers.
- Validated the method in a rat model of pulmonary fibrosis, showing impaired (129)Xe RBC replenishment in injured lung regions.
Conclusions:
- The developed (129)Xe MRI technique offers a direct, sensitive method for assessing lung gas transfer abnormalities.
- This imaging approach has significant potential for diagnosing and monitoring pulmonary diseases characterized by altered blood-gas barrier function.
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