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Stand-off electrode (SoE): a new method for improving the sensitivity distribution of a tetrapolar probe
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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, COLORADO STATE UNIV, FT COLLINS, COLORADO, AUG 01-07, 2002. Published in: PHYSIOLOGICAL MEASUREMENT, 24 (2). pp. 517-525. ISSN 0967-3334.
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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) | ||||
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Subjects: | Q Science > QH Natural history > QH301 Biology R Medicine Q Science > QP Physiology |
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Journal or Publication Title: | PHYSIOLOGICAL MEASUREMENT | ||||
Publisher: | IOP PUBLISHING LTD | ||||
ISSN: | 0967-3334 | ||||
Official Date: | May 2003 | ||||
Dates: |
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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 |
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