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Comparison Between a 2.45 GHz Planar and Circular Scanners for Biomedical Applications
Mälardalen University, School of Innovation, Design and Engineering. (Inteligent Sensor Systems)
2007 (English)In: International Conference on Electromagnetic Near-Field Characterization and  Imaging (ICONIC), St. Louis, MO, USA: International Conference on Electromagnetic Near-Field Characterization and Imaging (ICONIC) , 2007, , p. 6Conference paper, Published paper (Other academic)
Abstract [en]

Microwave imaging is an efficient technique to non-invasively visualizing dielectricproperties of non-metallic bodies. One potential of the technique is the high contrast in dielectricproperties between biological tissues. In the 80’s, Supélec developed a 2.45 GHz planarmicrowave camera, in the 90’s the group developed algorithms for quantitative microwaveimaging. The purpose of this study is to investigate the capability of these existing materials, oran extended version of them, in terms of quantitative imaging of high-contrast inhomogeneousobject for application of breast cancer detection. A two-dimensional formalization is consideredto be followed up with future three-dimensional investigations.

Place, publisher, year, edition, pages
St. Louis, MO, USA: International Conference on Electromagnetic Near-Field Characterization and Imaging (ICONIC) , 2007. , p. 6
Keywords [en]
Quantitative Microwave Imaging, Planar Microwave Camera, Breast Tumor Detection, Newton-Kantorovich
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electronics
Identifiers
URN: urn:nbn:se:mdh:diva-5876OAI: oai:DiVA.org:mdh-5876DiVA, id: diva2:217266
Projects
Microwaves in biomedicineAvailable from: 2009-05-13 Created: 2009-05-13 Last updated: 2009-05-13Bibliographically approved
In thesis
1. CONTRIBUTION TO QUANTITATIVE MICROWAVE IMAGING TECHNIQUES FOR BIOMEDICAL APPLICATIONS
Open this publication in new window or tab >>CONTRIBUTION TO QUANTITATIVE MICROWAVE IMAGING TECHNIQUES FOR BIOMEDICAL APPLICATIONS
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This dissertation presents a contribution to quantitative microwave imaging for breast tumor detection. The study made in the frame of a joint supervision Ph.D. thesis between University Paris-SUD 11 (France) and Mälardalen University (Sweden), has been conducted through two experimental microwave imaging setups, the existing 2.45 GHz planar camera (France) and the multi-frequency flexible robotic system, (Sweden), under development. In this context a 2D scalar flexible numerical tool based on a Newton-Kantorovich (NK) scheme, has been developed.

Quantitative microwave imaging is a three dimensional vectorial nonlinear inverse scattering problem, where the complex permittivity of an object is reconstructed from the measured scattered field, produced by the object. The NK scheme is used in order to deal with the nonlinearity and the ill-posed nature of this problem. A TM polarization and a two dimensional medium configuration have been considered in order to avoid its vectorial aspect. The solution is found iteratively by minimizing the square norm of the error with respect to the scattered field data. Consequently, the convergence of such iterative process requires, at least two conditions. First, an efficient calibration of the experimental system has to be associated to the minimization of model errors. Second, the mean square difference of the scattered field introduced by the presence of the tumor has to be large enough, according to the sensitivity of the imaging system.

The existing planar camera associated to a flexible 2D scalar NK code, are considered as an experimental platform for quantitative breast imaging. A preliminary numerical study shows that the multi-view planar system is quite efficient for realistic breast tumor phantoms, according to its characteristics (frequency, planar geometry and water as a coupling medium), as long as realistic noisy data are considered. Furthermore, a multi-incidence planar system, more appropriate in term of antenna-array arrangement, is proposed and its concept is numerically validated.

On the other hand, an experimental work which includes a new fluid-mixture for the realization of a narrow band cylindrical breast phantom, a deep investigation in the calibration process and model error minimization, is presented. This conducts to the first quantitative reconstruction of a realistic breast phantom by using multi-view data from the planar camera. Next, both the qualitative and quantitative reconstruction of 3D inclusions into the cylindrical breast phantom, by using data from all the retina, are shown and discussed. Finally, the extended work towards the flexible robotic system is presented.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2009. p. 113
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 73
Keywords
Quantitative Microwave Imaging. Inverse Problems, Nonliear Inverse Scattering, Diffraction Tomography, Breast Tumor Detection, Biomedical Imaging, Mammography, Calibration, Modeling, Planar 2.45 GHz Microwave Camera, Robot-based flexible multi-frequency data acquisition
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electronics
Identifiers
urn:nbn:se:mdh:diva-5882 (URN)978-91-86135-27-0 (ISBN)
Public defence
2009-06-09, Lambda, Högskoleplan 1, Västerås, 09:30 (English)
Opponent
Supervisors
Projects
Microwaves in biomedicine
Note
A dissertation prepared through an international convention for a joint supervision thesis with Université Paris-SUD 11, FranceAvailable from: 2009-05-14 Created: 2009-05-13 Last updated: 2009-05-25Bibliographically approved

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