Complex bioelectric impedance measurement system for the frequency range from 5 Hz to 1 MHz |
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Authors: | James J Ackmann |
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Institution: | (1) Department of Veterans Affairs Medical Center, Medical College of Wisconsin, Milwaukee, WI;(2) Department of Neurosurgery, Medical College of Wisconsin, 9200 W. Wisconsin Avenue, 53226 Milwaukee, WI |
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Abstract: | Analytic techniques that have been successfully employed in materials science, and to a lesser extent in the study of biologic
systems, have potential for improving the application of bioelectric impedance provided that both real and imaginary impedance
components can be measured with sufficient accuracy over a given frequency range. Since biologic tissue, particularly animal
tissue, is typically highly conductive, phase angles are small, making accurate measurements difficult. A practical four-terminal
system employing commercial lock-in amplifiers is described and error sources and corrective tech-niques are discussed. |
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Keywords: | Electric conductivity Electronic instrumentation |
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