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Lung water measurement by nuclear magnetic resonance: correlation with morphometry
A G Cutillo1, K C Goodrich, K Ganesan
1Department of Internal Medicine, University of Utah, Salt Lake City 84132, USA.
Journal of Applied Physiology (Bethesda, Md. : 1985)
|December 1, 1995
Summary
Nuclear magnetic resonance (NMR) reliably estimates lung water density, correlating closely with morphometric lung tissue volume density in both normal and injured rats. This noninvasive technique offers accurate assessments of lung water content.
Area of Science:
- Physiology
- Biomedical Engineering
- Medical Imaging
Background:
- Accurate quantification of lung water content is crucial for diagnosing and managing various respiratory conditions, including pulmonary edema.
- Traditional methods for assessing lung water can be invasive or indirect, limiting their clinical utility.
- Nuclear magnetic resonance (NMR) offers a noninvasive approach to measure tissue properties, but its application in quantifying lung water requires validation.
Purpose of the Study:
- To compare lung water content estimates derived from NMR with established morphometric and gravimetric methods.
- To evaluate the reliability of NMR in assessing lung water density (rho H2O) in both normal and experimentally induced lung injury models.
- To determine the influence of lung inflation pressure on NMR-derived lung water density measurements.
Main Methods:
- NMR measurements of lung water density (rho H2O) were performed on excised and in vivo rat lungs.
- Experimental groups included normal rats and rats with oleic acid-induced edema or saline-induced lung injury.
- Morphometric measurements of lung tissue volume density (Vv) and gravimetric lung water content (LWGr) were used for comparison.
Main Results:
- A strong correlation was found between NMR-derived rho H2O and morphometric Vv in both excised (r=0.910) and in vivo (r=0.897) lungs.
- Correlation coefficients between rho H2O and gravimetric LWGr were higher in vivo (r=0.857) compared to excised lungs (r=0.663-0.692).
- Lung inflation pressure significantly influenced rho H2O, but its effect was less pronounced than that of lung water accumulation in injury models.
Conclusions:
- NMR techniques provide reliable and noninvasive estimates of lung water density.
- The strong correlation with morphometric Vv validates NMR as a quantitative tool for lung water assessment.
- NMR measurements are sensitive to both lung water accumulation and variations in lung inflation pressure.