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A New Geometric Factor for In Situ Resistivity Measurement Using Four Slender Cylindrical Electrodes

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2 Author(s)
Chee-Earn Chong ; Nanyang Technol. Univ., Singapore ; Yoke-Lin Tan

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.

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Biomedical Engineering, IEEE Transactions on  (Volume:55 ,  Issue: 2 )