Electrode Models for Electric Current Computed Tomography

Kuo Sheng Cheng, David Isaacson, J. C. Newell, David G. Gisser

Research output: Contribution to journalArticle

402 Citations (Scopus)

Abstract

This paper develops a mathematical model for the physical properties of electrodes suitable for use in electric current computed tomography (ECCT). The model includes the effects of discretization, shunt, and contact impedance. The complete model was validated by experiment. Bath resistivities of 284.0, 139.7, 62.3, 29.5 Ω. cm were studied. Values of “effective” contact impedance z used in the numerical approximations were 58.0, 35.0, 15.0, and 7.5 Ω. cm2, respectively. Agreement between the calculated and experimentally measured values was excellent throughout the range of bath conductivities studied. It is desirable in electrical impedance imaging systems to model the observed voltages to the same precision as they are measured in order to be able to make the highest resolution reconstructions of the internal conductivity that the measurement precision allows. The complete electrode model, which includes the effects of discretization of the current pattern, the shunt effect due to the highly conductive electrode material, and the effect of an “effective” contact impedance, allows calculation of the voltages due to any current pattern applied to a homogeneous resistivity field.

Original languageEnglish
Pages (from-to)918-924
Number of pages7
JournalIEEE Transactions on Biomedical Engineering
Volume36
Issue number9
DOIs
Publication statusPublished - 1989 Sep

All Science Journal Classification (ASJC) codes

  • Biomedical Engineering

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