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Brain MRI with laser-polarized 129Xe
S D Swanson1, M S Rosen, B W Agranoff
1Department of Radiology, University of Michigan, Ann Arbor 48109-0553, USA.
Magnetic Resonance in Medicine
|November 14, 1997
Summary
This study shows laser-polarized 129Xe can be used for brain MRI in rats. The polarized xenon travels to the brain, allowing for imaging and future clinical blood flow measurements.
Area of Science:
- Medical Imaging
- Nuclear Magnetic Resonance (NMR)
- Small Animal Models
Background:
- Laser-polarized 129Xe (xenon-129) offers enhanced sensitivity for Magnetic Resonance Imaging (MRI).
- Previous studies have explored xenon's potential in medical imaging, but its application in brain MRI via laser polarization in vivo requires further validation.
Purpose of the Study:
- To demonstrate the feasibility of brain MRI using laser-polarized 129Xe in a small animal model.
- To establish that nuclear polarization survives transport from the lungs to the brain for imaging.
Main Methods:
- Naturally abundant 129Xe was laser-polarized and administered to Sprague-Dawley rats via inhalation.
- 2D chemical shift imaging was employed to acquire images of 129Xe distribution in the rat head with 98-microliter voxels.
- Spectroscopic analysis was performed to identify tissue-phase NMR resonances.
Main Results:
- Polarized 129Xe was successfully introduced into the lungs and transported via blood to the brain tissue.
- A dominant, single tissue-phase NMR resonance was observed at 194.5 ppm relative to the gas phase.
- 2D chemical shift imaging successfully localized 129Xe within the rat brain, confirming successful imaging.
Conclusions:
- The study successfully demonstrated the feasibility of brain MRI using laser-polarized 129Xe in a rat model.
- Nuclear polarization of 129Xe is maintained during transport to the brain, enabling in vivo imaging.
- Future advancements in polarization and volume delivery could enable clinical measurements of regional cerebral blood flow.