Stand-off electrode (SoE): a new method for improving the sensitivity distribution of a tetrapolar probe
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.Full text not available from this repository.
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
Q Science > QP Physiology
|Journal or Publication Title:||PHYSIOLOGICAL MEASUREMENT|
|Publisher:||IOP PUBLISHING LTD|
|Number of Pages:||9|
|Page Range:||pp. 517-525|
|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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