Title :
Instrumentation for electrical impedance measurements in biological media
Author :
Boulay, Christian ; Guardo, Robert ; Bertrand, Michel
Author_Institution :
Inst. de Genie Biomed., Ecole Polytech., Montreal, Que., Canada
Abstract :
Biomedical applications of electrical impedance measurement include real-time monitoring of cardiac output, ventricular work (P-V diagram), and respiration as well as imaging of the tissue conductivity distribution in the human body. To meet data acquisition requirements for these different research fields, a versatile instrumentation system (HEMOS 3) has been developed for multichannel impedance measurements. HEMOS 3 is a microcomputer-based system providing current stimulation, differential voltage measurement, quadrature demodulation, A/D conversion, and data processing. For impedance-imaging purposes, the system includes a multiplexer for current-stimulating electrodes which allows the definition of a programmable sequence of projections. The system is fully controllable by a personal computer via an opto-isolated port. A system description and preliminary results for an impedance-imaging experiment are presented.<>
Keywords :
bioelectric phenomena; biomedical equipment; computerised instrumentation; electric impedance measurement; A/D conversion; HEMOS 3; biological media; cardiac output; current stimulation; data processing; differential voltage measurement; electrical impedance measurement instrumentation; human body; microcomputer-based system; multiplexer; opto-isolated port; quadrature demodulation; real-time monitoring; respiration; tissue conductivity distribution; ventricular work;
Conference_Titel :
Engineering in Medicine and Biology Society, 1988. Proceedings of the Annual International Conference of the IEEE
Conference_Location :
New Orleans, LA, USA
Print_ISBN :
0-7803-0785-2
DOI :
10.1109/IEMBS.1988.95089
