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research-article

An analytical poroelastic model of a non-homogeneous medium under creep compression for ultrasound poroelastography applications - Part I

[+] Author and Article Information
Md Tauhidul Islam

Graduate Research Assistant, Ultrasound and Elasticity Imaging Laboratory, Department of Electrical & Computer Engineering, Texas A&M University, College Station, Texas, USA-77840
tauhid@tamu.edu

J.N. Reddy

Professor, Department of Mechanical Engineering, Texas A&M University, College Station, Texas, USA-77840
jnreddy@tamu.edu

Raffaella Righetti

Associate Professor, Department of Electrical & Computer Engineering, Texas A&M University, College Station, Texas, USA-77840
righetti@ece.tamu.edu

1Corresponding author.

ASME doi:10.1115/1.4040603 History: Received November 27, 2017; Revised June 16, 2018

Abstract

An analytical theory for the unconfined creep behavior of a cylindrical inclusion (simulating a soft tissue tumor) embedded in a cylindrical background sample (simulating normal tissue) is presented and analyzed in this paper. Both the inclusion and the background are considered as fluid-filled, porous materials, each of them being characterized by a set of mechanical properties. Specifically, in this paper, the inclusion is considered to be less permeable than the background. The cylindrical sample is compressed using a constant pressure within two frictionless plates and is allowed to expand in an unconfined way along the radial direction. Analytical expressions for the effective Poisson's ratio (EPR) and fluid pressure inside and outside the inclusion are derived and analyzed. The theoretical results are validated using finite element models (FEM). Statistical analysis shows excellent agreement between the results obtained from the developed model and the results from FEM. Thus the developed theoretical model can be used in medical imaging modalities such as ultrasound poroelastography to extract the mechanical parameters of tissues and/or to better understand the impact of the different mechanical parameters on the estimated displacements, strains, stresses and fluid pressure inside a tumor and in the surrounding tissue.

Copyright (c) 2018 by ASME
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