Abstract by Kyle Larsen
Physics and Astronomy
Bioimpedance spectroscopy for non-invasive health monitoring
Bioimpedance spectroscopy is performed by injecting a safe level of current at different frequencies into living tissue and measuring the resulting voltage. Impedance as a function of frequency can then be found with Ohm’s Law. The measured impedance will change as the tissue undergoes physiological changes. For example, the cardiac pulse can be detected by a four electrode system placed over the radial artery on the underside of the wrist. Two of the electrodes carry the current and the other two sense the voltage. This system is sensitive to placement relative to the artery – small misalignments can lead to total degradation of the pulsatile signal. In this work, we model how the placement of electrodes affects the sensitivity of the system using analytical and finite element models. Our results indicate a configuration that places a current carrying electrode directly under the artery, which differs from the typical configuration of equally spaced electrodes placed symmetrically about the artery.