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Dynamic 3He imaging for quantification of regional lung ventilation parameters.
David Dupuich1, Yves Berthezène, Pierre-Louis Clouet
1Laboratoire de RMN, CNRS 5012, Université Lyon-1, Villeurbanne, France.
Magnetic Resonance in Medicine
|October 3, 2003
Summary
This study introduces the SPIRO technique for dynamic lung ventilation imaging. SPIRO quantifies regional lung ventilation parameters, showing decreased inflation rates with methacholine-induced bronchoconstriction.
Area of Science:
- Pulmonary Physiology and Imaging
- Medical Physics
- Respiratory Medicine
Background:
- Dynamic ventilation imaging using laser-polarized Helium-3 ((3)He) offers potential for understanding lung function and disease.
- Accurate quantification of local ventilation parameters is crucial for detailed physiological and pathological assessments.
- Existing methods may lack the temporal resolution or quantitative capabilities needed for comprehensive analysis.
Purpose of the Study:
- To propose and validate a novel methodological approach for assessing and quantifying local ventilation parameters in the lungs.
- To develop a technique combining high-temporal-resolution imaging with advanced signal processing for detailed ventilation mapping.
- To evaluate the proposed technique in both healthy and diseased (bronchoconstriction) animal models.
Main Methods:
- Acquisition of high-temporal-resolution coronal ventilation image series using a projection-reconstruction (PR) sequence and sliding-window technique.
- Development of the Sliding Pulmonary Imaging for Respiratory Overview (SPIRO) technique, integrating acquisition and signal processing.
- In vivo testing in healthy and methacholine-induced bronchoconstriction rat models with controlled (3)He injection.
Main Results:
- Generation of pixel-by-pixel parametric maps detailing gas arrival time, filling time constant, inflation rate, and gas volume.
- Successful application of the SPIRO technique in vivo, demonstrating its feasibility for dynamic lung imaging.
- Observed decrease in lung inflation rate values with increasing doses of methacholine, correlating with bronchoconstriction.
Conclusions:
- The SPIRO technique enables quantitative regional gas dynamic information acquisition during a single polarized gas inspiration.
- This method provides a valuable tool for elucidating lung physiology and physiopathology with high spatial and temporal resolution.
- SPIRO demonstrates sensitivity to changes in lung mechanics, as evidenced by its ability to detect dose-dependent decreases in inflation rate during bronchoconstriction.