Scaling behavior in crackle sound during lung inflation

Autor:	Adriano M. Alencar, Sergey V. Buldyrev, Béla Suki, José S. Andrade, J. Tolnai, Zoltán Hantos, Stefano Zapperi, Ferenc Peták, T. Asztalos, H. E. Stanley
Rok vydání:	1999
Předmět:	Physics Bioacoustics Acoustics Attenuation Mathematical analysis Computer Science::Software Engineering Ringing Power law Tree structure Nonlinear acoustics Cascade otorhinolaryngologic diseases sense organs Scaling
Zdroj:	Scopus-Elsevier
ISSN:	1095-3787 1063-651X
DOI:	10.1103/physreve.60.4659
Popis:	During slow inflation of lung lobes, we measure a sequence of short explosive transient sound waves called "crackles," each consisting of an initial spike followed by ringing. The crackle time series is irregular and intermittent, with the number of spikes of size s following a power law, n(s) proportional, variants(-alpha), with alpha=2.77+/-0.05. We develop a model of crackle wave generation and propagation in a tree structure that combines the avalanchelike opening of airway segments with the wave propagation of crackles in a tree structure. The agreement between experiments and simulations suggests that (i) the irregularities are a consequence of structural heterogeneity in the lung, (ii) the intermittent behavior is due to the avalanchelike opening, and (iii) the scaling is a result of successive attenuations acting on the sound spikes as they propagate through a cascade of bifurcations along the airway tree.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1b9453748e5bd2760a3512e7fb34d9f7 https://doi.org/10.1103/physreve.60.4659 Zobrazit plný text záznamu