A method for modelling and optimizing an electrical impedance tomography system

Physiological Measurement
Alzbeta E HartingerR Guardo

Abstract

Electrical impedance tomography (EIT) image reconstruction is an ill-posed problem requiring maximum measurement precision. Recent EIT systems claim 60 to 80 dB precision. Achieving higher values is hard in practice since measurements must be performed at relatively high frequency, on a living subject, while using components whose tolerance is usually higher than 0.1%. To circumvent this difficulty, a method for modelling the electronic circuits of an EIT system was developed in order to optimize the circuits and incorporate the model in the reconstruction algorithms. The proposed approach is based on a matrix method for solving electrical circuits and has been applied to the scan-head which contains the front-end electronic circuits of our system. The method is used to simulate the system characteristic curves which are then optimized with the Levenberg-Marquardt method to find optimal component values. A scan-head was built with the new component values and its simulated performance curves were compared with network analyser measurements. As a result of the optimization, the impedance at the operating frequency was increased to minimize the effects of variations in skin/electrode contact impedance. The transconductance and ga...Continue Reading

References

Aug 1, 1988·IEEE Transactions on Bio-medical Engineering·J RosellJ G Webster
Jan 1, 1987·Clinical Physics and Physiological Measurement : an Official Journal of the Hospital Physicists' Association, Deutsche Gesellschaft Für Medizinische Physik and the European Federation of Organisations for Medical Physics·H Griffiths, A Ahmed
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Jan 1, 1996·IEEE Transactions on Medical Imaging·A Adler, R Guardo

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Citations

Nov 26, 2009·IEEE Transactions on Bio-medical Engineering·Alzbeta E HartingerHervé Gagnon
Mar 11, 2009·IEEE Transactions on Bio-medical Engineering·Alzbeta E HartingerHervé Gagnon
Jun 17, 2010·IEEE Transactions on Bio-medical Engineering·Hervé GagnonAlzbeta E Hartinger
Aug 1, 2007·Physiological Measurement·Alzbeta E HartingerRobert Guardo
Sep 23, 2014·Physiological Measurement·Weida Zhang, David Li
Jan 1, 2014·Journal of Medical Engineering·Tushar Kanti Bera

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