Experimental study of 3D contactless conductivity detection using microwave radiometry: A possible method for investigation of brain conductivity fluctuations

Karanasiou, IS; Uzunoglu, NK

dc.contributor.author	Karanasiou, IS	en
dc.contributor.author	Uzunoglu, NK	en
dc.date.accessioned	2014-03-01T02:42:46Z
dc.date.available	2014-03-01T02:42:46Z
dc.date.issued	2004	en
dc.identifier.issn	05891019	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/31070
dc.subject	Contactless passive measurement	en
dc.subject	Ellipsoidal beam-former	en
dc.subject	Focused microwave radiometry	en
dc.subject	Measurement of conductivity variations	en
dc.subject.other	Bandwidth	en
dc.subject.other	Biomedical engineering	en
dc.subject.other	Brain	en
dc.subject.other	Dipole antennas	en
dc.subject.other	Electric conductivity	en
dc.subject.other	Magnetoelectric effects	en
dc.subject.other	Mathematical models	en
dc.subject.other	Radiometry	en
dc.subject.other	Receiving antennas	en
dc.subject.other	Temperature distribution	en
dc.subject.other	Contactless passive measurement	en
dc.subject.other	Ellipsoidal beam-former	en
dc.subject.other	Focused microwave radiometry	en
dc.subject.other	Measurement of conductivity variation	en
dc.subject.other	Microwaves	en
dc.title	Experimental study of 3D contactless conductivity detection using microwave radiometry: A possible method for investigation of brain conductivity fluctuations	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1109/IEMBS.2004.1403669	en
heal.identifier.secondary	http://dx.doi.org/10.1109/IEMBS.2004.1403669	en
heal.publicationDate	2004	en
heal.abstract	The capability of detecting electrical conductivity variations using Focused Microwave Radiometry, a method used in clinical applications for temperature distribution imaging of subcutaneous tissues, is discussed in the present study. A novel microwave radiometric system operating at 3.5GHz, including an ellipsoidal conductive wall cavity, which provides the required beamforming and focusing, is developed. The system is capable of providing distribution measurements of the product of conductivity and temperature of any object being at a temperature above the absolute zero. The implemented experimental procedure is based on the results of an electromagnetic numerical analysis using a semi-analytical method which was developed in order to compute the focusing properties of the ellipsoidal reflector. Each measurement is realized by placing the region of interest in the area of the first focus of the cavity and collecting the radiation converged at the second by an almost isotropic dipole antenna connected to a sensitive radiometer. Experimental data from cylindrical shaped saline or de-ionized water filled tank phantoms in which saline solutions of different concentrations were infused, provide promising results concerning the system's ability of detecting conductivity variations. Future research is needed in order to elucidate the potential of the proposed methodology to be used for brain conductivity measurements.	en
heal.journalName	Annual International Conference of the IEEE Engineering in Medicine and Biology - Proceedings	en
dc.identifier.doi	10.1109/IEMBS.2004.1403669	en
dc.identifier.volume	26 III	en
dc.identifier.spage	2303	en
dc.identifier.epage	2306	en