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Doppler grid surface scanning applications for pulmonary subsurface parenchymal perfusion assessment
M Brenner1, T E Milner, N S Wang
1Department of Medicine, University of California Irvine Medical Center, Orange, USA.
Journal of Clinical Laser Medicine & Surgery
|December 1, 1996
Summary
Assessing subsurface lung perfusion is challenging. New laser Doppler imaging technology effectively measures pleural subsurface perfusion in normal and abnormal lungs, offering a valuable research tool.
Area of Science:
- Pulmonary Physiology
- Medical Imaging
- Laser Doppler Technology
Background:
- Assessing subsurface lung perfusion in live ventilated animals is difficult.
- Current point-sampling Doppler flow techniques have inherent limitations.
Purpose of the Study:
- To evaluate a novel laser Doppler grid scanning imaging technology for measuring pleural subsurface lung perfusion.
- To assess its applicability in normal and abnormal animal lungs.
Main Methods:
- Quantitative noncontact laser Doppler imaging was used to measure perfusion over a 900-pixel grid in rabbit lungs.
- Measurements were taken during normal ventilation, high inspiratory pressure holds, and post-inflation.
- Perfusion-pressure response curves were generated in normal lung.
Main Results:
- Normal lung showed high pleural subsurface perfusion.
- Atelectasis decreased perfusion, which normalized after lung inflation.
- Increased inflation pressure progressively reduced perfusion in normal lung.
- Bullae exhibited markedly decreased perfusion, unresponsive to inflation pressure.
Conclusions:
- Noncontact laser Doppler grid perfusion imaging is a novel tool for large-area pleural subsurface perfusion assessment.
- The technique provides rapid, reproducible, and consistent results, reducing sampling errors.
- It demonstrated inspiratory pressure-related perfusion reduction, reversible atelectasis effects, and reduced perfusion in abnormal lung regions.