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A comparison of techniques to optimize measurement of voltage changes in electrical impedance tomography by minimizing phase shift errors

Fitzgerald, AJ; Holder, DS; Eadie, L; Hare, C; Bayford, RH; (2002) A comparison of techniques to optimize measurement of voltage changes in electrical impedance tomography by minimizing phase shift errors. IEEE T MED IMAGING , 21 (6) 668 - 675. 10.1109/TMI.2002.800577. Green open access

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Abstract

In electrical impedance tomography, errors due to stray capacitance may be reduced by optimization of the reference phase of the demodulator. Two possible methods, maximization of the demodulator output and minimization of reciprocity error have been assessed, applied to each electrode combination individually, or to all combinations as a whole. Using an EIT system with a single impedance measuring circuit and multiplexer to address the 16 electrodes, the methods were tested on resistor-capacitor networks, saline-filled tanks and humans during variation of the saline concentration of a constant fluid volume in the stomach. Optimization of each channel individually gave less error, particularly on humans, and maximization of the output of the demodulator was more robust. This method is, therefore, recommended to optimize systems and reduce systematic errors with similar EIT systems.

Type: Article
Title: A comparison of techniques to optimize measurement of voltage changes in electrical impedance tomography by minimizing phase shift errors
Open access status: An open access version is available from UCL Discovery
DOI: 10.1109/TMI.2002.800577
Keywords: demodulator, EIT, reciprocity error, SYSTEM, EIT
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Med Phys and Biomedical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/9616
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