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Related Experiment Videos

Charting human thoracic airways by aerosols.

J Heyder

    Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Fur Medizinische Physik and the European Federation of Organisations for Medical Physics
    |February 1, 1983
    PubMed
    Summary

    This study introduces a non-invasive method to measure human airway size at various lung depths using aerosol particle loss during breath-holding. The findings reveal significant changes in average airway radius with depth, aligning with existing lung models.

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    Area of Science:

    • Pulmonary Physiology
    • Respiratory Mechanics
    • Aerosol Science

    Background:

    • Accurate measurement of airway calibre is crucial for understanding respiratory function and disease.
    • Current lung models rely on estimations of airway dimensions, necessitating validation through direct or indirect measurements.

    Purpose of the Study:

    • To develop and validate a non-invasive method for estimating average airway calibre as a function of volumetric depth in the human respiratory tract.
    • To assess the variability of airway radius across different lung depths.

    Main Methods:

    • Utilized monodisperse aerosols with a 1.5-micron aerodynamic diameter and 45-micron settling velocity.
    • Measured gravitational particle losses during breath-holding from aerosol boli inspired to varying lung depths (80-820 cm3).

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  • Calculated average airway radius for each lung depth based on the exponential decay of recovered particles.

    • Main Results:

    • Particle recovery decreased exponentially with breath-holding duration.
    • Average airway radius varied significantly with lung depth.
    • Observed airway radii ranged from 630-1400 microns at 120 cm3 and 165-280 microns at 600 cm3 lung depth across six subjects.

    Conclusions:

    • The developed non-invasive method effectively estimates average airway calibre as a function of lung depth.
    • The measured airway radii are consistent with those incorporated in current lung models.
    • This technique offers a valuable tool for respiratory research and clinical assessment.