Overview Of Impedance Sensors

John E. Abele

doi:10.1117/12.952160

8 August 1989 Overview Of Impedance Sensors

John E. Abele

Proceedings Volume 1068, Catheter-Based Sensing and Imaging Technology; (1989) https://doi.org/10.1117/12.952160
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

Abstract

Electrical impedance has been one of the many "tools of great promise" that physicians have employed in their quest to measure and/or monitor body function or physiologic events. So far, the expectations for its success have always exceeded its performance. In simplistic terms, physiologic impedance is a measure of the resistance in the volume between electrodes which changes as a function of changes in that volume, the relative impedance of that volume, or a combination of these two. The history and principles of electrical impedance are very nicely reviewed by Geddes and Baker in their textbook "Principles of Applied Biomedical Instrumentation". It is humbling, however, to note that Cremer recorded variations in electrical impedance in frog hearts as early as 1907. The list of potential applications includes the measurement of thyroid function, estrogen activity, galvanic skin reflex, respiration, blood flow by conductivity dilution, nervous activity and eye movement. Commercial devices employing impedance have been and are being used to measure respiration (pneumographs and apneamonitors), pulse volume (impedance phlebographs) and even noninvasive cardiac output.

Citation Download Citation

John E. Abele "Overview Of Impedance Sensors", Proc. SPIE 1068, Catheter-Based Sensing and Imaging Technology, (8 August 1989); https://doi.org/10.1117/12.952160

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