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Poro-Visco-Elastic Modeling of Mechanical Wave Motion in the Lungs

[+] Author Affiliations
Ying Peng, Zoujun Dai, Thomas J. Royston

University of Illinois at Chicago, Chicago, IL

Hansen A. Mansy

Rush University Medical Center, Chicago, IL

Paper No. SBC2012-80544, pp. 751-752; 2 pages
doi:10.1115/SBC2012-80544
From:
  • ASME 2012 Summer Bioengineering Conference
  • ASME 2012 Summer Bioengineering Conference, Parts A and B
  • Fajardo, Puerto Rico, USA, June 20–23, 2012
  • Conference Sponsors: Bioengineering Division
  • ISBN: 978-0-7918-4480-9
  • Copyright © 2012 by ASME

abstract

Noninvasive measurement of mechanical wave motion (sound and vibration) in the lungs may be of diagnostic value, as it can provide information about the mechanical properties of the lungs, which in turn are affected by disease and injury. In this study, two theoretical models of the vibro-acoustic behavior of the lung parenchyma are compared: (1) a Biot theory of poroviscoelasticity and (2) a simplified “bubble swarm” model for compression wave behavior. A “slow” compression wave speed predicted by the Biot theory formulation agrees well with the bubbly swarm theory in both analytical calculations and computational simulation. Biot theory also predicts a fast compression wave and a shear wave. The relative contributions of all three wave types are assessed. The effect of the air volume fraction is also investigated. Preliminary experimental measurements of the slow compression wave speed in the lung parenchyma are carried out and agree with theoretical predictions.

Copyright © 2012 by ASME
Topics: Waves , Modeling , Lung

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