Book III: Scientific and Research Applications in Medical Care: Targets of Convenience for Computer Automated Measurements of Electrical Tissue Impedance Spectra

摘要

A microcomputer automated system capable of measuring electrical impedance, both magnitude and phase angle, of biological tissues at 27 discrete frequencies from 50 Hz to 300 kHz is described. In vitro measurements on various canine tissues are reported; results show significantly different, characteristic and reproducible patterns for the anatomically different tissues. Results from in vivo canine studies with a needle electrode array show dramatic liver impedance changes with variation in liver blood supply and significant skeletal muscle impedance changes with electrode orientation. System limitations and directions of the next developments are discussed.