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Robot Controlled Data Acquisition System for Microwave Imaging
Mälardalen University, School of Innovation, Design and Engineering. (Intelligent sensor system)ORCID iD: 0000-0002-2457-3079
Mälardalen University, School of Innovation, Design and Engineering. (Intelligent sensor system)
L2S/ Supélec/Universite Paris-Sud 11. (Départament de recherche en Électromagnétisme)
Mälardalen University, School of Innovation, Design and Engineering. (Intelligent sensor system)ORCID iD: 0000-0003-3860-761X
2009 (English)In: 3rd European Conference on Antennas and Propagation, 2009, , p. 5p. 3240-3244Conference paper, Published paper (Refereed)
Abstract [en]

In this paper an experimental prototype of a robot controlled data acquisition system for microwave imaging is presented, where the transmitting and receiving antennas are immersed in a water-tank. The scattered field from the object under test is acquired by using the robot and scanning a single receiving antenna in cylindrical or half spherical coordinates, while the transmitting antenna is fixed at one position with possibilities to be manually moved to different positions. Careful design and construction of the system has given accurate measurements of incident and total field with a SNR of 45dB. A validation of the robot system is performed by comparing measured and computed data for a sunflower oil object.In this paper an experimental prototype of a robot controlled data acquisition system for microwave imaging is presented, where the transmitting and receiving antennas are immersed in a water-tank. The scattered field from the object under test is acquired by using the robot and scanning a single receiving antenna in cylindrical or half spherical coordinates, while the transmitting antenna is fixed at one position with possibilities to be manually moved to different positions. Careful design and construction of the system has given accurate measurements of incident and total field with a SNR of 45dB. A validation of the robot system is performed by comparing measured and computed data for a sunflower oil object.

Place, publisher, year, edition, pages
2009. , p. 5p. 3240-3244
Keywords [en]
Microwave Imaging, data acquisition, experimental data, monopole antenna, system validation
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electronics
Identifiers
URN: urn:nbn:se:mdh:diva-5895ISI: 000276522101309ISBN: 978-1-4244-4753-4 (print)OAI: oai:DiVA.org:mdh-5895DiVA, id: diva2:217345
Conference
3rd European Conference on Antennas and Propagation Location: Berlin, GERMANY Date: MAR 23-27, 2009
Projects
Microwaves in biomedicineAvailable from: 2009-05-14 Created: 2009-05-14 Last updated: 2014-12-08Bibliographically 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
2. Measurement System for Microwave Imaging Towards a Biomedical Application
Open this publication in new window or tab >>Measurement System for Microwave Imaging Towards a Biomedical Application
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
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.

Place, publisher, year, edition, pages
Västerås: Mälardalen University, 2014
Series
Mälardalen University Press Dissertations, ISSN 1651-4238 ; 157
Keywords
Microwave imaging, antenna applicator, data acquisition, nonlinear inverse scattering
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Electronics
Identifiers
urn:nbn:se:mdh:diva-24878 (URN)978-91-7485-146-5 (ISBN)
Public defence
2014-05-28, Paros, Mälardalens högskola, Västerås, 10:00 (English)
Opponent
Supervisors
Available from: 2014-04-23 Created: 2014-04-23 Last updated: 2015-02-04Bibliographically approved

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Petrovic, NikolaOtterskog, Magnus

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