Title: Design of a tissue resonator indenter device for measurement of soft tissue viscoelastic properties
Authors: Alireza Hariri, Jean W. Zu
Addresses: Hatch Limited, Sheridan Science and Technology Park, 2800 Speakman Drive, Mississauga, Ontario, L5K 2R7, Canada. ' Department of Mechanical and Industrial Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario, M5S 3G8, Canada
Abstract: The design of a new device called tissue resonator indenter device (TRID) for measuring soft tissue viscoelastic properties is presented. The two degrees-of-freedom device works based on mechanical vibration principles. When TRID comes into contact with a soft tissue, it identifies the tissue|s viscoelastic properties through the change of its natural frequencies and damping ratios. By working in the linear viscoelastic domain, TRID is designed to identify tissue properties in the range of 0-100 Hz. Assuming Kelvin tissue model, a method is developed for determining unknown tissue parameters using input-output data from TRID. A parametric identification method using the prediction error approach is proposed for identifying the unknown tissue parameters, which is proved to be globally identifiable, in a grey-box state-space model. The effectiveness of the identification method is demonstrated using simulation in the presence of considerable input and output noises.
Keywords: biomechatronics; soft tissue; tissue indentation; vibration; tissue resonator indenter; viscoelastic properties; grey-box identification; prediction error method; simulation.
International Journal of Biomechatronics and Biomedical Robotics, 2010 Vol.1 No.2, pp.104 - 114
Published online: 06 May 2010 *Full-text access for editors Access for subscribers Purchase this article Comment on this article