This paper reports on a numerical study on how the elasticity of soft tissue measured by a Compression-Relaxation (C-R) testing method via a two-dimensional (2D) distributed-deflection sensor varies with the tissue parameters (i.e., elasticity, thickness and in-plane dimension). The 2D sensor entails a polydimethylsiloxane (PDMS) micro structure embedded with a 3×3 sensing-plate/transducer array deposited on a Pyrex substrate. By moving the 2D sensor against a soft tissue region with a pre-defined compression pattern, the average deflection-depth slope of the deflections of the sensing-plate array versus the compression depth of the testing tissue is measured, and is translated to the measured tissue elasticity via a 1D theoretical model. Since the measured tissue elasticity arises from the tissue-sensor interaction, a numerical model, which includes the 2D sensor and a soft tissue underneath, is created in COMSOL to investigate the sensitivity of the measured tissue elasticity to tissue parameters including tissue thickness, in-plane dimension and elasticity. The numerical results reveal that the theoretical model causes a 20% overestimate on the inherent tissue elasticity in the range of 25kPa∼200kPa. The measured tissue elasticity does not vary with tissue thickness when tissue thickness is above 6mm. However, a relatively thin tissue leads to higher measured tissue elasticity. As long as the tissue in-plane dimension is larger than the sensor in-plane dimension, the measured tissue elasticity is insensitive to the tissue in-plane dimension.
Skip Nav Destination
ASME 2017 International Mechanical Engineering Congress and Exposition
November 3–9, 2017
Tampa, Florida, USA
Conference Sponsors:
- ASME
ISBN:
978-0-7918-5836-3
PROCEEDINGS PAPER
Numerical Analysis of Elasticity Measurement of Soft Tissues via a 2D Distributed-Deflection Sensor: Significance of Tissue Parameters
Yichao Yang,
Yichao Yang
Old Dominion University, Norfolk, VA
Search for other works by this author on:
Arthur Weidemann,
Arthur Weidemann
Old Dominion University, Norfolk, VA
Search for other works by this author on:
Charles Tison,
Charles Tison
Old Dominion University, Norfolk, VA
Search for other works by this author on:
Zhili Hao
Zhili Hao
Old Dominion University, Norfolk, VA
Search for other works by this author on:
Yichao Yang
Old Dominion University, Norfolk, VA
Arthur Weidemann
Old Dominion University, Norfolk, VA
Charles Tison
Old Dominion University, Norfolk, VA
Zhili Hao
Old Dominion University, Norfolk, VA
Paper No:
IMECE2017-70601, V003T04A085; 6 pages
Published Online:
January 10, 2018
Citation
Yang, Y, Weidemann, A, Tison, C, & Hao, Z. "Numerical Analysis of Elasticity Measurement of Soft Tissues via a 2D Distributed-Deflection Sensor: Significance of Tissue Parameters." Proceedings of the ASME 2017 International Mechanical Engineering Congress and Exposition. Volume 3: Biomedical and Biotechnology Engineering. Tampa, Florida, USA. November 3–9, 2017. V003T04A085. ASME. https://doi.org/10.1115/IMECE2017-70601
Download citation file:
15
Views
Related Proceedings Papers
Related Articles
Mixed Experimental and Numerical Approach for Characterizing the Biomechanical Response of the Human Leg Under Elastic Compression
J Biomech Eng (March,2010)
A Conewise Linear Elasticity Mixture Model for the Analysis of Tension-Compression Nonlinearity in Articular Cartilage
J Biomech Eng (December,2000)
Related Chapters
Introduction and Scope
High Frequency Piezo-Composite Micromachined Ultrasound Transducer Array Technology for Biomedical Imaging
Processing/Structure/Properties Relationships in Polymer Blends for the Development of Functional Polymer Foams
Advances in Multidisciplinary Engineering
The Orbit
Fundamentals of Rotating Machinery Diagnostics