Contactless passive diagnosis for brain intracranial applications: A study using dielectric matching materials

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

dc.contributor.author	Gouzouasis, IA	en
dc.contributor.author	Karathanasis, KT	en
dc.contributor.author	Karanasiou, IS	en
dc.contributor.author	Uzunoglu, NK	en
dc.date.accessioned	2014-03-01T01:33:03Z
dc.date.available	2014-03-01T01:33:03Z
dc.date.issued	2010	en
dc.identifier.issn	0197-8462	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/20293
dc.subject	Brain temperature fluctuations	en
dc.subject	Conductivity variations	en
dc.subject	Ellipsoidal cavity	en
dc.subject	Microwave radiometry	en
dc.subject	Multiband radiometric receiver	en
dc.subject.classification	Biology	en
dc.subject.classification	Biophysics	en
dc.subject.other	HUMAN VISUAL-CORTEX	en
dc.subject.other	MICROWAVE RADIOMETRY	en
dc.subject.other	HYPERTHERMIA SYSTEM	en
dc.subject.other	FOCUSING PROPERTIES	en
dc.subject.other	TEMPERATURE	en
dc.subject.other	FREQUENCY	en
dc.subject.other	TISSUES	en
dc.title	Contactless passive diagnosis for brain intracranial applications: A study using dielectric matching materials	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/bem.20572	en
heal.identifier.secondary	http://dx.doi.org/10.1002/bem.20572	en
heal.language	English	en
heal.publicationDate	2010	en
heal.abstract	A prototype system for passive intracranial monitoring using microwave radiometry is proposed. It comprises an ellipsoidal conductive wall cavity to achieve beamforming and focusing, in conjunction with sensitive multiband receivers for detection. The system has already shown the capability to provide temperature and/or conductivity variations in phantoms and biological tissue. In this article, a variant of the initially constructed modality is theoretically and experimentally investigated. Specifically, dielectric matching materials are used in an effort to improve the system's focusing attributes. The theoretical study investigates the effect of dielectric matching materials on the system's detection depth, whereas measurements with phantoms focus on the investigation of the system's detection level and spatial resolution. The combined results suggest that the dielectric matching layers lead to the improvement of the system's detection depth and temperature detection level. Also, the system's spatial resolution is explored at various experimental setups. Theoretical and experimental results conclude that with the appropriate combination of operation frequencies and dielectric layers, it is possible to monitor areas of interest inside human head models with a variety of detection depths and spatial resolutions. Bioelectromagnetics 31:335-349, 2010. (C) 2010 Wiley-Liss, Inc.	en
heal.publisher	WILEY-LISS	en
heal.journalName	Bioelectromagnetics	en
dc.identifier.doi	10.1002/bem.20572	en
dc.identifier.isi	ISI:000279035200001	en
dc.identifier.volume	31	en
dc.identifier.issue	5	en
dc.identifier.spage	335	en
dc.identifier.epage	349	en