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Hyperpolarized 83Kr MRI of lungs
Zackary I Cleveland1, Galina E Pavlovskaya, Nancy D Elkins
1Department of Chemistry, Colorado State University, Fort Collins, CO 80523, USA.
Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|October 25, 2008
Summary
Hyperpolarized krypton-83 (83Kr) MRI shows potential for lung imaging. This study confirms its feasibility in ex vivo rat lungs, with signals primarily from alveoli, suggesting novel contrast possibilities.
Area of Science:
- Medical Imaging
- Biophysics
- Pulmonary Medicine
Background:
- Hyperpolarized (hp) 83Kr is a sensitive gas-phase contrast agent.
- It responds to lung surface chemistry, surface-to-volume ratio, and temperature.
Purpose of the Study:
- Demonstrate the feasibility of ex vivo hp 83Kr MRI of lungs.
- Investigate the origin of the MR signal within lung structures.
Main Methods:
- Used natural abundance krypton gas (11.5% 83Kr) for hp 83Kr MRI.
- Employed excised rat lungs in a custom ventilation chamber.
- Compared signal intensity from lungs to a control balloon.
Main Results:
- Confirmed feasibility of ex vivo hp 83Kr lung MRI.
- Observed that the majority of the signal originated from lung alveoli.
- Measured reproducible 83Kr longitudinal relaxation times (T1) ranging from 0.7 to 3.7s.
Conclusions:
- Hp 83Kr MRI is feasible for ex vivo lung imaging.
- Signal localization suggests alveolar origin, differentiating from conducting airways.
- Potential for novel MRI contrast based on T1 variations in lungs.
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