DocumentCode :
953674
Title :
A New Geometric Factor for In Situ Resistivity Measurement Using Four Slender Cylindrical Electrodes
Author :
Chong, Chee-Earn ; Tan, Yoke-Lin
Author_Institution :
Nanyang Technol. Univ., Singapore
Volume :
55
Issue :
2
fYear :
2008
Firstpage :
594
Lastpage :
602
Abstract :
The four-electrode method is commonly used for in situ measurement of the electrical resistivity of biological tissues. In this paper, a new geometric factor between the resistivity and measured resistance using the four-electrode interface is derived in the prolate spheroidal coordinates and experimentally validated. Evaluation of the experimental results shows that the resistivities determined using both the derived geometric factor and a commercial conductivity meter are in close agreement even when the length of the immersed electrodes becomes long with respect to the inter-electrode spacing. The evaluation also shows the effect of the relative size of the sample volume when the limitation to semi-infinite volume begins to result in poor accuracy.
Keywords :
bioelectric phenomena; biological tissues; biomedical electrodes; electrical resistivity; biological tissues; electrical resistivity; geometric factor; in situ resistivity; resistance; slender cylindrical electrodes; Biological systems; Biological tissues; Computer errors; Computer simulation; Conductivity measurement; Coordinate measuring machines; Current distribution; Electric resistance; Electric variables measurement; Electrical resistance measurement; Electrodes; Immune system; Polarization; Probes; Solid modeling; Testing; Four-electrode method; prolate spheroidal coordinates; resistivity measurement; Algorithms; Computer Simulation; Diagnosis, Computer-Assisted; Electric Impedance; Electrodes; Models, Biological; Plethysmography, Impedance; Reproducibility of Results; Sensitivity and Specificity;
fLanguage :
English
Journal_Title :
Biomedical Engineering, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9294
Type :
jour
DOI :
10.1109/TBME.2007.903704
Filename :
4360091
Link To Document :
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