Fast EIT data acquisition system with active electrodes and its application to cardiac imaging

Physiological Measurement
J H LiU Faust

Abstract

A wide-band high-speed data acquisition system for electrical impedance tomography (EIT) is described. 32 active electrodes are used in the system, half of them as receive electrodes and the other half as drive electrodes. A buffer is mounted on the back of each receive electrode and a current source on each drive electrode. A multielectrode system with active electrodes was built to make it convenient to attach all the electrodes on the human thorax. The system is suitable for both dynamic imaging and multifrequency electrical impedance tomography (MFEIT). Its operating frequency can be chosen between 24 kHz and 400 kHz. Current is injected sequentially into 16 adjacent current electrode pairs and the 16 voltages between adjacent receive electrodes are measured for each current injection. ECG is collected to determine the relationship between the reconstructed images and cardiac activity. The collection of one frame of data is completed within 25 ms. The system has been successfully used for imaging the variation of conductivity distribution of the human thorax. The beat-by-beat cardiac-related change of conductivity distribution has been imaged by our system. The quasi-periodic variation of the impedance distribution can be s...Continue Reading

References

Jan 1, 1988·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·F J McArdleD C Barber
Feb 1, 1995·IEEE Transactions on Bio-medical Engineering·R W SmithB H Brown
May 1, 1996·Medical & Biological Engineering & Computing·J H LiU Faust

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Citations

Feb 16, 2008·International Journal of Biomedical Imaging·Yair GranotBoris Rubinsky
Jul 30, 2014·IEEE Transactions on Biomedical Circuits and Systems·Loucas ConstantinouAndreas Demosthenous
Jun 22, 2014·IEEE Transactions on Bio-medical Engineering·Ryan J Halter, Young-Joong Kim
Oct 1, 2009·IEEE Transactions on Biomedical Circuits and Systems·A McEwanD S Holder
Jul 18, 2017·IEEE Transactions on Bio-medical Engineering·Andy Adler, Alistair Boyle
Aug 1, 2007·Physiological Measurement·A McEwanD S Holder
Apr 26, 2012·Physiological Measurement·Pascal Olivier GaggeroPeter Seitz

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