Journal ArticleDOI
A passive 3D imaging thermograph using microwave radiometry
TLDR
In this article, the authors discuss the feasibility of a microwave radiometric system to measure, non-invasively, temperature distribution in subcutaneous tissues, including possibly intracranial brain diagnostic applications.Abstract:
The present paper discusses the feasibility of a novel microwave radiometric system to measure, non-invasively, temperature distribution in subcutaneous tissues, including possibly intracranial brain diagnostic applications. The operation principle of the system is based on the use of an ellipsoidal conductive wall cavity, which provides the required focusing and the ability of imaging via contactless measurements. The basis of the theoretical analysis of this work is the fundamental law of the chaotic radiation emitted by material objects (microwave electromagnetic thermal noise) being at a temperature above the absolute zero. In the framework of the present research the theoretical principles along with phantom and animal experiments are presented.read more
Citations
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Journal ArticleDOI
Development and Laboratory Testing of a Noninvasive Intracranial Focused Hyperthermia System
TL;DR: Both computation and phantom measurement results show that deep focused brain hyperthermia may be achievable with adequate spatial resolution and sensitivity using the proposed methodology, subject to the appropriate combination of operation frequency and low-loss dielectric material used as filling in the ellipsoidal.
Journal ArticleDOI
Design and Interdisciplinary Simulations of a Hand-Held Device for Internal-Body Temperature Sensing Using Microwave Radiometry
N.-A. I. Livanos,Sami Hammal,Christos D. Nikolopoulos,Anargyros T. Baklezos,Christos N. Capsalis,Grigorios Koulouras,Panagiotis I. Charamis,I. O. Vardiambasis,A. Nassiopoulos,Spiros Kostopoulos,Pantelis A. Asvestas,Dionisis Cavouras,Elias Siores +12 more
TL;DR: The development of contemporary complex technological systems prerequisites interdisciplinary design and simulation methodologies, and this work demonstrates an approach to manufacturing a hand-held device aiming at internal body temperature measurements using passive microwave radiometer technology.
Journal ArticleDOI
Noninvasive Focused Monitoring and Irradiation of Head Tissue Phantoms at Microwave Frequencies
K.T. Karathanasis,I. A. Gouzouasis,I.S. Karanasiou,Melpomeni Giamalaki,George E. Stratakos,Nikolaos K. Uzunoglu +5 more
TL;DR: The present results show that the system is able to detect local concentrated gradual temperature and conductivity variations expressed as an increase of the output radiometric voltage, and when contactless focused hyperthermia is performed, the results show significant temperature increase at specific phantom areas.
Journal ArticleDOI
Experimental Study of a Hybrid Microwave Radiometry—Hyperthermia Apparatus With the Use of an Anatomical Head Phantom
TL;DR: This paper presents the latest progress made concerning a hybrid diagnostic and therapeutic system able to provide focused microwave radiometric temperature and/or conductivity variation measurements and hyperthermia treatment using an anatomical head model as phantom.
Journal ArticleDOI
Contactless passive diagnosis for brain intracranial applications: A study using dielectric matching materials.
TL;DR: 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.
References
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Abstract: Maxwell's equations are replaced by a set of finite difference equations. It is shown that if one chooses the field points appropriately, the set of finite difference equations is applicable for a boundary condition involving perfectly conducting surfaces. An example is given of the scattering of an electromagnetic pulse by a perfectly conducting cylinder.
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The dielectric properties of biological tissues: II. Measurements in the frequency range 10 Hz to 20 GHz
TL;DR: Three experimental techniques based on automatic swept-frequency network and impedance analysers were used to measure the dielectric properties of tissue in the frequency range 10 Hz to 20 GHz, demonstrating that good agreement was achieved between measurements using the three pieces of equipment.
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The dielectric properties of biological tissues: III. Parametric models for the dielectric spectrum of tissues
TL;DR: A parametric model was developed to enable the prediction of dielectric data that are in line with those contained in the vast body of literature on the subject.
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The dielectric properties of biological tissues: I. Literature survey
TL;DR: The dielectric properties of tissues have been extracted from the literature of the past five decades and presented in a graphical format to assess the current state of knowledge, expose the gaps there are and provide a basis for the evaluation and analysis of corresponding data from an on-going measurement programme.