RESEARCH ARTICLE


New Method for Separation of Electrode Polarization Impedance from Measured Tissue Impedance



Håvard Kalvøy 1, 2, *, Gorm K Johnsen 2, Ørjan G Martinsen 1, 2, Sverre Grimnes 1, 2
1 Dept. of Clinical and Biomedical Eng, Rikshospitalet, Oslo Univ. Hospital, Norway
2 Dept. of Physics, Univ. of Oslo, Norway


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© Kalvøy et al.; Licensee Bentham Open.

open-access license: This is an open access article licensed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited.

* Address correspondence to this author at the Oslo Univ. Hospital, Rik-shospitalet, Pb 4950, 0424 Oslo, Norway; Tel: +4723073982; Fax: +4723071590; E-mail: havard.kalvoy@gmail.com


Abstract

In this paper we have shown that electrode polarization impedance (EPI) can be separated from measured tissue impedance as long as the characteristic frequencies of EPI and tissue are not too close, so that the EPI is largely displayed as a separate dispersion. In 2-electrode measurements the EPI and sample are physically connected in series, and commonly modelled by equivalent components in series. We have calculated the parallel equivalent elements and converted the series connected EPI and sample to a parallel admittance model. By curve fitting on the converted model we have shown that this provides a new method for estimating the EPI with enhanced accuracy compared to similar techniques used on the impedance model.

Keywords: Admittance model, cole-equation, curve fitting, multiple dispersions..