Development of a real-time adaptive current tomograph.

Following the successful development of a multiple-drive electrical impedance tomography system OXPACT-II featuring a voltage-driven current method for in vitro studies, research work currently being undertaken at the EIT research group in Oxford is aimed at developing a real-time multiple-drive adaptive system, called the Oxford Brookes Adaptive Current Tomograph Mark-III (OXBACT-III) which will operate at several frequencies in between 10-160 kHz. The objective of this system development is to enable EIT clinical studies to be undertaken based on the adaptive current method. One of the most important issues addressed in the new system design is to achieve high data acquisition speed while maintaining sufficient system accuracy. This paper will describe the overall data acquisition system structure and relevant system performance specifications.

[1]  F. J. Lidgey,et al.  An adaptive current tomograph using voltage sources , 1993, IEEE Transactions on Biomedical Engineering.

[2]  P J Riu,et al.  A broadband system for multifrequency static imaging in electrical impedance tomography. , 1992, Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics.

[3]  W R Breckon,et al.  Electrical impedance tomography. Electrode current determination from programmable voltage sources. , 1992, Clinical physics and physiological measurement : an official journal of the Hospital Physicists' Association, Deutsche Gesellschaft fur Medizinische Physik and the European Federation of Organisations for Medical Physics.

[4]  F. J. Lidgey,et al.  High CMRR, second generation current-mode instrumentation amplifiers , 1993, 1993 IEEE International Symposium on Circuits and Systems.