UNSPECIFIED (2003) Stand-off electrode (SoE): a new method for improving the sensitivity distribution of a tetrapolar probe. In: 1st Mummy Range Workshop on Electrical Impedence Tomography, AUG 01-07, 2002, COLORADO STATE UNIV, FT COLLINS, COLORADO.

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Abstract

Tetrapolar probes have been widely used for measuring the impedance spectra of tissues. However, the non-uniform sensitivity distribution of these probes limits the ability to identify conductivity changes in tissue. This paper presents a novel method for improving the sensitivity distribution beneath a tetrapolar probe. The method consists of placing a hydrogel layer between the probe and the tissue in order to make the sensitivity positive everywhere within the tissue. Theoretical and measured sensitivity distributions are compared. A good agreement between theoretical and measured data from an electrolytic tank was obtained with a maximum error of 1.3%. In vivo forearm measurements showed that the use of a conductive layer does enable tissue conductivity spectra to be determined. A smaller variation between subjects was obtained when using the stand-off. It was not possible to assess the absolute accuracy of the method due to the absence of a 'gold standard' for the measurement of tissue conductivity spectra.

Item Type:	Conference Item (UNSPECIFIED)
Subjects:	Q Science > QH Natural history > QH301 Biology R Medicine Q Science > QP Physiology
Journal or Publication Title:	PHYSIOLOGICAL MEASUREMENT
Publisher:	IOP PUBLISHING LTD
ISSN:	0967-3334
Date:	May 2003
Volume:	24
Number:	2
Number of Pages:	9
Page Range:	pp. 517-525
Publication Status:	Published
Title of Event:	1st Mummy Range Workshop on Electrical Impedence Tomography
Location of Event:	COLORADO STATE UNIV, FT COLLINS, COLORADO
Date(s) of Event:	AUG 01-07, 2002
URI:	http://wrap.warwick.ac.uk/id/eprint/9676

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