title: [Estimation of biological tissue conductivity with contact-free magnetic impedance measurements].
abstract: At present, there are several methods that utilize electrical conductivity of biological tissue, such as biological impedance spectroscopy (BIS). Because these techniques use conductivity values for further analysis (e.g., body water distribution, etc.), accuracy of conductivity measurement is crucial. Traditionally, most impedance-based techniques rely on conductive interaction between tissue and external electrical measurement devices. Thus, electrode properties can influence the results of conductivity measurements. In this study, a contact-free measurement technique is presented, which is based on magnetic induction of eddy currents and measurement of the tiny reinduced voltages in external measurement coils. Our results indicate that it is principally possible to determine conductivity of biological tissue with this technique.
authors.affiliation: Philips Lehrstuhl für Medizinische Informationstechnik, Helmholtz-Institut für Biomedizinische Technik, RWTH Aachen, Aachen, Deutschland. cordes@hia.rwth-aachen.de
authors.forename: Axel
authors.initials: A
authors.lastname: Cordes
authors.forename: Matthias
authors.initials: M
authors.lastname: Steffen
authors.forename: Steffen
authors.initials: S
authors.lastname: Leonhardt
mesh_terms: D000818:Animals; D017076:Computer-Aided Design; D017097:Electric Impedance; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D008280:Magnetics / Q000295:instrumentation*; D010992:Plethysmography, Impedance / Q000295:instrumentation*