V.N.Oliynik Effect of properties of alveolar walls on value of sound speed in the lung parenchyma |
Acoustic bulletin, Vol. 6 ¹ 4, (2003) |
| An acoustic model of the parenchyma is offered, modified by accounting for elastic properties of alveolar walls, transpulmonary pressure and forces of surface tension acting on the gas-tissue interface. The problem of acoustic modeling of the lung tissue is reduced to consideration of individual spherical bubble with supported surface pulsing in an infinite liquid. It is ascertained that the basic role in reinforcement of the surface of the alveole is played by longitudinal rigidity of its walls. Calculated value of increase of sound speed in mammalian parenchyma due to reinforcement of alveoles does not exceed 20%. It is shown that most strongly the reinforcement influences the properties of lungs of large mammals, which alveoles contain bigger share of elastin and collagen. Carried out comparison of the theoretical data with the experimental ones has shown satisfactory agreement between them. |
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KEY WORDS: acoustic model, pulmonary parenchyma, alveoles, transpulmonary pressure, spherical bubble with supported surface |
| TEXT LANGUAGE: Ukrainian |