The viscoelastic properties of lung tissue are of interest in medicine as they have been shown to be affected by various pathologies. Identifying the mechanical properties of lung tissue first requires a means of quantitatively measuring phenomena, such as mechanical wave motion, that are affected by these properties. In the present study, lung surface motion is measured on excised pig lungs to determine suitable viscoelastic models. The relation between the surface wave speed and the frequency is analyzed and different viscoelastic models are used to fit this relation. Also a more comprehensive method to evaluate the frequency-dependent shear modulus of the pig lung measuring the propagation of surface waves on the surface of the lung is presented and viscoelastic models (both of integer and fractional order) are compared to experimental results over the frequency range of 100-500 Hz.
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