Real-time extraction of tissue impedance model parameters for electrical impedance spectrometer |
| |
Authors: | S Kun B Ristic R A Peura and R M Dunn |
| |
Institution: | (1) Biomedical Engineering Department, Worcester Polytechnic Institute, 100 Institute Road, 01609 Worcester, MA, USA;(2) Department of Plastic Surgery, University of Massachusetts Medical Center, 55 Lake Avenue, 01655 North Worcester, MA, USA |
| |
Abstract: | This paper presents a new algorithm for real-time extraction of tissue electrical impedance model parameters from in vivo
electrical impedance spectroscopic measurements. This algorithm was developed as a part of a system for muscle tissue ischemia
measurements using electrical impedance spectroscopy. An iterative least square fitting method, biased with a priori knowledge
of the impedance model was developed. It simultaneously uses both the real and imaginary impedance spectra to calculate tissue
parameters R0, R∞, α and τ. The algorithm was tested with simulated data, and during real-time in vivo ischemia experiments. Experimental results
were achieved with standard deviations of
, σα=0.72%, and στ=1.26%. On a Pentium II based PC, the algorithm converges to within 0.1% of the results in 17 ms. The results show that the
algorithm possesses excellent parameter extraction capabilities, repeatability, speed and noise rejection. |
| |
Keywords: | Impedance Spectroscopy Parametric modelling |
本文献已被 SpringerLink 等数据库收录! |
|