Simulation and experimental study of an ellipsoidal cavity reflector as part of a focused passive brain imaging system

Karathanasis, KT; Gouzouasis, IA; Karanasiou, IS; Uzunoglu, NK

dc.contributor.author	Karathanasis, KT	en
dc.contributor.author	Gouzouasis, IA	en
dc.contributor.author	Karanasiou, IS	en
dc.contributor.author	Uzunoglu, NK	en
dc.date.accessioned	2014-03-01T02:51:48Z
dc.date.available	2014-03-01T02:51:48Z
dc.date.issued	2008	en
dc.identifier.issn	16800737	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/35663
dc.subject	Brain temperature fluctuations	en
dc.subject	Conductivity variations	en
dc.subject	Ellipsoidal cavity	en
dc.subject	Hyperthermia	en
dc.subject	Microwave radiometry	en
dc.subject.other	Brain temperatures	en
dc.subject.other	Conductivity variation	en
dc.subject.other	Ellipsoidal cavity	en
dc.subject.other	Hyperthermia	en
dc.subject.other	Microwave radiometry	en
dc.subject.other	Conductive materials	en
dc.subject.other	Focusing	en
dc.subject.other	Imaging systems	en
dc.subject.other	Microwaves	en
dc.subject.other	Radiometers	en
dc.subject.other	Radiometry	en
dc.subject.other	Reflection	en
dc.subject.other	Temperature distribution	en
dc.subject.other	Dielectric materials	en
dc.title	Simulation and experimental study of an ellipsoidal cavity reflector as part of a focused passive brain imaging system	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1007/978-3-540-89208-3_372	en
heal.identifier.secondary	http://dx.doi.org/10.1007/978-3-540-89208-3_372	en
heal.publicationDate	2008	en
heal.abstract	An ellipsoidal cavity used as a reflector to achieve selective beamforming and focusing on body areas of interest has been successfully used the past few years as one of the main modules of a microwave radiometry imaging system. Based on passive remote microwave monitoring, this system has been designed and constructed for brain intracranial applications. During the past years, it has been extensively tested both theoretically and experimentally and results have shown that it seems capable to measure changes of temperature and/or conductivity in phantoms and subcutaneous tissues. The objective of the present research is twofold: on one hand to theoretically study new configurations of the system by changing the ellipsoidal reflector setup and dielectric filling material; on the other, to experimentally examine the system performance using a new, volume reduced cavity that has been constructed based on previous theoretical results. More specifically, new simulations retaining only one half of the ellipsoidal conductive wall cavity filled with dielectric matching materials were carried out, with the view to potentially improve the system's focusing attributes and result in the construction of a more portable version of the existing system. In parallel, experiments with phantoms using a new, modified ellipsoidal cavity are carried out to identify its focusing properties and to verify previous theoretical studies. The obtained results suggest that by using the appropriate combination of operation frequencies, ellipsoidal reflector dimensions and dielectric filling material, it is possible to monitor focusing areas of interest with a variety of detection depths and spatial resolution in order to meet the desired focusing requirements of a given imaging application. © 2009 Springer Berlin Heidelberg.	en
heal.journalName	IFMBE Proceedings	en
dc.identifier.doi	10.1007/978-3-540-89208-3_372	en
dc.identifier.volume	22	en
dc.identifier.spage	1565	en
dc.identifier.epage	1569	en