Single-frequency and multiband microwave radiometry for feasible brain conductivity variation imaging during reactions to external stimuli

Karanasiou, IS; Uzunoglu, NK

dc.contributor.author	Karanasiou, IS	en
dc.contributor.author	Uzunoglu, NK	en
dc.date.accessioned	2014-03-01T01:25:09Z
dc.date.available	2014-03-01T01:25:09Z
dc.date.issued	2006	en
dc.identifier.issn	0168-9002	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17568
dc.subject	Conductivity variations	en
dc.subject	Ellipsoidal reflector	en
dc.subject	Microwave radiometry	en
dc.subject	Single and multi-frequency radiometers	en
dc.subject.classification	Instruments & Instrumentation	en
dc.subject.classification	Nuclear Science & Technology	en
dc.subject.classification	Physics, Particles & Fields	en
dc.subject.classification	Spectroscopy	en
dc.subject.other	Biomedical engineering	en
dc.subject.other	Brain	en
dc.subject.other	Imaging systems	en
dc.subject.other	Measurement theory	en
dc.subject.other	Medical imaging	en
dc.subject.other	Conductivity variations	en
dc.subject.other	Ellipsoidal reflectors	en
dc.subject.other	Microwave radiometry	en
dc.subject.other	Multi-frequency radiometers	en
dc.subject.other	Radiometry	en
dc.title	Single-frequency and multiband microwave radiometry for feasible brain conductivity variation imaging during reactions to external stimuli	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.nima.2006.08.137	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.nima.2006.08.137	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	Recent research results imply that microwave radiometry may exhibit the capability of detecting local variations of the conductivity attributes of the media under measurement. The contactless measurements in question are a function of the geometrical spatial properties of a newly developed microwave radiometry imaging system (MiRaIS), comprising an ellipsoidal conductive wall cavity. The proposed methodology is based on single-frequency and multiband microwave radiometry in conjunction with the implementation of an ellipsoidal reflector to achieve focusing on the areas of interest. The theoretical fundamentals as well as an overview of the system modules and past experimental results are herein presented, forming the background and context on which current and future research is based. Experimentation using small water phantoms in order to verify the system's focusing properties and saline solution phantoms in order to investigate the system's capability of sensing conductivity changes at various microwave frequencies with a sensitive multiband receiver has been conducted. The results show that local resistance variations in small phantoms can be detected at microwave frequencies by the MiRaIS. Combining these experimental data with previous human experimental results, the feasibility of brain conductivity variation imaging during reactions to external stimuli by the proposed system is examined and discussed in the present paper. (c) 2006 Elsevier B.V. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment	en
dc.identifier.doi	10.1016/j.nima.2006.08.137	en
dc.identifier.isi	ISI:000243241300094	en
dc.identifier.volume	569	en
dc.identifier.issue	2 SPEC. ISS.	en
dc.identifier.spage	581	en
dc.identifier.epage	586	en