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Characterization of transmitted motion in fetal lung: Quantitative analysis
Author(s) -
Adler Ronald,
Rubin Jonathan M.,
Bland Peyton,
Carson Paul
Publication year - 1989
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1002/j.2473-4209.1989.tb36306.x
Subject(s) - viscoelasticity , compressibility , physics , motion (physics) , deformation (meteorology) , shear modulus , mechanics , mathematical analysis , classical mechanics , mathematics , meteorology , thermodynamics
A simple two‐dimensional analytic model is evaluated for transmitted cardiac motion in fetal lung. The model treats the latter as being an incompressible viscoelastic medium. The mean radial deformation in an elastic medium is demonstrated to depend on a length parameter l ~ μ / ρ ω 2, where μ, ρ, and ω corespond to elastic shear modulus, mass density, and frequency of cardiac motion, respectively. Digitized M‐mode images are demonstrated as a feasible method to measure such deformations in vivo . Data for two patients are presented to illustrate the technique.