A Feasibility Study of Tissue Characterization Using LC Sensors

Author

Yvanoff, Marie ; Venkataraman, Jayanti

Author_Institution

Rochester Inst. of Technol., Rochester, NY

Volume

57

Issue

4

fYear

2009

fDate

4/1/2009 12:00:00 AM

Firstpage

885

Lastpage

893

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;

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2009.2016073

Filename

4812228