Investigations into optimum characteristics for the coupling medium in UWB breast cancer imaging systems

Abbosh, A. M., Bialkowski, M. E. and Crozier, S. (2008). Investigations into optimum characteristics for the coupling medium in UWB breast cancer imaging systems. In: M. Thorburn, IEEE Antennas and Propagation Society International Symposium, AP-S 2008. 2008 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, San Diego, United States, (2998-3001). 5-12 July 2008. doi:10.1109/APS.2008.4619669


Author Abbosh, A. M.
Bialkowski, M. E.
Crozier, S.
Title of paper Investigations into optimum characteristics for the coupling medium in UWB breast cancer imaging systems
Conference name 2008 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting
Conference location San Diego, United States
Conference dates 5-12 July 2008
Proceedings title IEEE Antennas and Propagation Society International Symposium, AP-S 2008
Journal name 2008 IEEE International Symposium on Antennas and Propagation and USNC/URSI National Radio Science Meeting, APSURSI
Place of Publication Piscataway, United States
Publisher IEEE
Publication Year 2008
Year available 2008
Sub-type Fully published paper
DOI 10.1109/APS.2008.4619669
ISBN 9781424420414
9781424420421
Editor M. Thorburn
Start page 2998
End page 3001
Total pages 4
Language eng
Abstract/Summary Recent years have seen an increased interest in ultra wideband (UWB) microwave imaging systems as an important alternative for mammography and other techniques such as magnetic resonance imaging or ultra sound in breast cancer detection. The reason is that microwaves offer a safe and low cost option for patients screening in comparison with these alternatives [1, 2]. The feasibility of UWB microwave imaging relies on two fundamental properties: Firstly, tumours have higher water content and hence a higher dielectric constant compared with the normal breast tissues, which is mainly fat. Therefore, a strong scattering takes place at the boundary between the normal tissue and lesions. Secondly, microwave attenuation in normal breast tissue is less than 4.5dB/cm across an UW frequency band of 3.1 to 10.6 GHz. This value of attenuation permits the microwave imaging system to detect small size, early-stage tumours. In order to enhance the detection process for a given dynamic range of the breast radar, recent approaches to UWB microwave imaging tend to employ a coupling medium between an imaged object (the breast) and an illuminating device (an antenna). In this case, both the antenna and the breast are immersed in a coupling medium. The reflected/scattered signal is collected and analysed to get a three dimensional image of the object depending on its dielectric profile. The use of a coupling medium minimizes the reflection at the skin interface, thereby reducing the propagation loss, and thus increases the dynamic range and resolution of the imaging system. The reviewing of the literature related to this important topic shows that the researchers use a coupling medium with a dielectric constant which is either equal to that of the skin or the normal tissue [3-5]. Neither of these two choices addresses the question of the optimal characteristics of the coupling medium. In this paper, a theoretical analysis, supported by computer simulations, is conducted to work out the - - optimal characteristics of the coupling medium.
Formatted Abstract/Summary
Recent years have seen an increased interest in ultra wideband (UWB) microwave imaging systems as an important alternative for mammography and other techniques such as magnetic resonance imaging or ultra sound in breast cancer detection. The reason is that microwaves offer a safe and low cost option for patients screening in comparison with these alternatives. The feasibility of UWB microwave imaging relies on two fundamental properties: Firstly, tumours have higher water content and hence a higher dielectric constant compared with the normal breast tissues, which is mainly fat. Therefore, a strong scattering takes place at the boundary between the normal tissue and lesions. Secondly, microwave attenuation in normal breast tissue is less than 4.5dB/cm across an UW frequency band of 3.1 to 10.6 GHz. This value of attenuation permits the microwave imaging system to detect small size, early-stage tumours. In order to enhance the detection process for a given dynamic range of the breast radar, recent approaches to UWB microwave imaging tend to employ a coupling medium between an imaged object (the breast) and an illuminating device (an antenna). In this case, both the antenna and the breast are immersed in a coupling medium. The reflected/scattered signal is collected and analysed to get a three dimensional image of the object depending on its dielectric profile. The use of a coupling medium minimizes the reflection at the skin interface, thereby reducing the propagation loss, and thus increases the dynamic range and resolution of the imaging system. The reviewing of the literature related to this important topic shows that the researchers use a coupling medium with a dielectric constant which is either equal to that of the skin or the normal tissue. Neither of these two choices addresses the question of the optimal characteristics of the coupling medium. In this paper, a theoretical analysis, supported by computer simulations, is conducted to work out the optimal characteristics of the coupling medium.
©2008 IEEE
Subjects E1
090303 Biomedical Instrumentation
920102 Cancer and Related Disorders
Keyword Band
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Conference Paper
Sub-type: Fully published paper
Collections: 2009 Higher Education Research Data Collection
School of Information Technology and Electrical Engineering Publications
 
Versions
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 0 times in Thomson Reuters Web of Science Article
Scopus Citation Count Cited 16 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Sat, 11 Apr 2009, 23:58:08 EST by Donna Clark on behalf of School of Information Technol and Elec Engineering