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Permittivity Measurements with a Resonant Cavity to Develop Human Tissue Phantoms for Microwave Imaging
Mälardalens högskola, Akademin för innovation, design och teknik.ORCID-id: 0000-0002-2457-3079
Mälardalens högskola, Akademin för innovation, design och teknik.ORCID-id: 0000-0003-3860-761X
2009 (Engelska)Ingår i: Proceedings of the 8th International Conference on Electromagnetic Wave Interaction with Water and Moist Substances (ISEMA 2009) / [ed] Pertti Vainikainen, Helsinki, 2009, s. 190-195Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

In order to create human tissue phantoms for a microwave imaging system, a method to determine the complex permittivity is needed. For this reason a cavity perturbation method has been analyzed and used to perform measurements characterizing the complex permittivity of different fluid mixtures. Results show good agreement on single frequency between the measurement with the reentrant cavity and references. However the complex part of the final material mixture mimicking human tissue are higher than expected, which makes 1.2-propylene glycol inappropriate as a human tissue phantom material. The cavity perturbation method is still a suitable method for measuring liquids and with more work it might even be reliable for gel-based materials.

Ort, förlag, år, upplaga, sidor
Helsinki, 2009. s. 190-195
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
URN: urn:nbn:se:mdh:diva-8946ISBN: 978-951-22-9940-9 (tryckt)OAI: oai:DiVA.org:mdh-8946DiVA, id: diva2:301507
Konferens
8th International Conference on Electromagnetic Wave Interaction with Water and Moist Substances (ISEMA 2009),June 1-5, 2009, Espoo, Finland
Tillgänglig från: 2010-03-03 Skapad: 2010-03-03 Senast uppdaterad: 2014-12-08Bibliografiskt granskad
Ingår i avhandling
1. Measurement System for Microwave Imaging Towards a Biomedical Application
Öppna denna publikation i ny flik eller fönster >>Measurement System for Microwave Imaging Towards a Biomedical Application
2014 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Microwave imaging techniques have shown excellent capabilities in various fields such as civil engineering, nondestructive testing, industrial applications, and have in recent decades experienced strong growth as a research topic in biomedical diagnostics. Many research groups throughout the world work on prototype systems for producing images of human tissues in different biomedical applications, particularly breast tumor detection. However, the research community faces many challenges and in order to be competitive to other imaging modalities one of the means is to put emphasis on experimental work. Consequently, the use of flexible and accurate measurement systems, together with the design and fabrication of suitable antennas, are essential to the development of efficient microwave imaging systems.

The first part of this thesis focuses on measurement systems for microwave imaging in terms of antenna design and development, robot controlled synthetic array geometries, permittivity measurements, and calibration. The aim was to investigate the feasibility of a flexible system for measuring the fields around an inhomogeneous object and to create quantitative images. Hence, such an aim requires solving of a nonlinear inverse scattering problem, which in turn requires accurate measurements for producing good quality experimental data. The presented solution by design of a flexible measurement system is validated by examination of microwave imaging from experimental data with a breast phantom.

The second part of the thesis deals with the research challenges of designing high performance antennas to be placed in direct contact with or in close proximity to the imaged object. The need for novel antenna applicators is envisaged in the framework of the Mamacell measurement system, where the antenna applicators have to be designed and constructed to effectively couple the energy into the imaging object. For this purpose the main constraints and design requirements are a narrow lobe of the antenna, very small near-field effects, and small size. Numerical simulations and modeling shows that the proposed ridged waveguide antenna is capable of fulfilling the design requirements and the performance goals, demonstrating the potential for the future microwave imaging system called Mamacell.

Ort, förlag, år, upplaga, sidor
Västerås: Mälardalen University, 2014
Serie
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 157
Nyckelord
Microwave imaging, antenna applicator, data acquisition, nonlinear inverse scattering
Nationell ämneskategori
Elektroteknik och elektronik
Forskningsämne
elektronik
Identifikatorer
urn:nbn:se:mdh:diva-24878 (URN)978-91-7485-146-5 (ISBN)
Disputation
2014-05-28, Paros, Mälardalens högskola, Västerås, 10:00 (Engelska)
Opponent
Handledare
Tillgänglig från: 2014-04-23 Skapad: 2014-04-23 Senast uppdaterad: 2015-02-04Bibliografiskt granskad

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Petrovic, NikolaOtterskog, Magnus

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