Title :
A Feasibility Study of Tissue Characterization Using LC Sensors
Author :
Yvanoff, Marie ; Venkataraman, Jayanti
Author_Institution :
Rochester Inst. of Technol., Rochester, NY
fDate :
4/1/2009 12:00:00 AM
Abstract :
Bio-implantable sensors using radio-frequency telemetry links that enable the continuous monitoring and recording of physiological data are receiving a great deal of attention. The objective of this paper is to study the feasibility of an implantable sensor for tissue characterization. This has been done by querying an LC sensor surrounded by dispersive tissues by an external antenna. The resonant frequency of the sensor is monitored by measuring the input impedance of the antenna, and correlated to the desired quantities. Using an equivalent circuit model of the sensor that accounts for the properties of the encapsulating tissue, analytical expressions have been developed for the extraction of the tissue permittivity and conductivity. Finally, experimental validation has been performed with a telemetry link that consists of a loop antenna and a fabricated LC sensor immersed in single and multiple dispersive phantom materials.
Keywords :
bioelectric phenomena; biomedical telemetry; electrical conductivity measurement; loop antennas; patient monitoring; permittivity measurement; phantoms; radiotelemetry; LC sensors; bioimplantable sensors; continuous monitoring; dispersive tissues; equivalent circuit model; external antenna; input impedance measurement; loop antenna; multiple dispersive phantom materials; physiological data recording; radio-frequency telemetry links; single dispersive phantom materials; tissue characterization; tissue conductivity extraction; tissue permittivity extraction; Antenna measurements; Biomedical monitoring; Biosensors; Dispersion; Impedance measurement; Permittivity measurement; Radio frequency; Resonant frequency; Sensor phenomena and characterization; Telemetry; Biological tissue; LC sensor; RF telemetry; interdigital capacitor;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2009.2016073
