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research-article

Finite element based optimization of human fingertip optical elastography

[+] Author and Article Information
Altaf Khan

Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 842 W. Taylor Street MC 251, Chicago, IL 60607-7052, USA
altafa.khan321@gmail.com

Steven Kearney

Department of Mechanical and Industrial Engineering, University of Illinois at Chicago, 842 W. Taylor Street MC 251, Chicago, IL 60607-7052, USA; Advanced Photon Source, Argonne National Laboratory, 9700 S Cass Avenue, Argonne, IL 60439, USA
skearn3@gmail.com

Thomas J. Royston

Richard and Loan Hill Department of Bioengineering, University of Illinois at Chicago, 851 South Morgan Street MC 063, Chicago, IL 60607-7072, USA
troyston@uic.edu

1Corresponding author.

ASME doi:10.1115/1.4040199 History: Received January 26, 2018; Revised May 03, 2018

Abstract

Dynamic elastography methods attempt to quantitatively map soft tissue viscoelastic properties. Application to the fingertip, relevant to medical diagnostics and to improving tactile interfaces, is a novel and challenging application, given the small target size. In this feasibility study, an annular actuator placed on the surface of the fingertip and driven harmonically at multiple frequencies sequentially creates geometrically focused surface waves. These surface wave propagation patterns are measured using scanning laser Doppler vibrometry. Reconstruction (the inverse problem) is performed in order to estimate fingertip soft tissue viscoelastic properties. The study identifies limitations of an analytical approach and introduces an optimization approach that utilizes a finite element model. Measurement at multiple frequencies reveals limitations of an assumption of homogeneity of material properties. Identified shear viscoelastic properties increase significantly as frequency increases and the depth of penetration of the surface wave is reduced, indicating that the fingertip is significantly stiffer near its surface.

Copyright (c) 2018 by ASME
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