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A novel approach of high-resolution UWB microwave imaging system based on an improved 3D back-projection method for early-stage breast cancer detection applications

Published online by Cambridge University Press:  24 July 2020

M. Mehranpour Open the ORCID record for M. Mehranpour [Opens in a new window] ,
S. Jarchi Open the ORCID record for S. Jarchi [Opens in a new window] ,
A. Ghorbani  and
A. Keshtkar
M. Mehranpour
Affiliation:
Faculty of Technical and Engineering, Imam Khomeini International University, Qazvin, Iran
S. Jarchi*
Affiliation:
Faculty of Technical and Engineering, Imam Khomeini International University, Qazvin, Iran
A. Ghorbani
Affiliation:
Amirkabir University of Technology, Tehran, Iran
A. Keshtkar
Affiliation:
Faculty of Technical and Engineering, Imam Khomeini International University, Qazvin, Iran
*
Author for correspondence: S. Jarchi, E-mail: s.jarchi@eng.ikiu.ac.ir
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Abstract

In this paper, a novel approach of high-accuracy calibration (HAC) method is employed to improve the resolution of tumor detection within a fibro-glandular breast model, and also an improved 3D back-projection approach to scan each focal point inside of the breast is presented. For these purposes, a simulated hemispherical setup of a multi-static array with a modified UWB bowtie antenna is applied around the breast. The superiority of the proposed HAC method is that all-time delays of multi-static channel paths are taken into account at preprocessing of reflected signals, and therefore the time location of tumor response can be estimated accurately in the late stage of recorded signals. As a result, stronger signals are obtained to detect the location of the tumor with higher spatial accuracy. By using the improved 3D back-projection method, a better approximation of transmission channel paths based on Fermat's principle is achieved. A realistic breast model is proposed with two cases of single and twin spherical tumors. Then, to validate the efficiency of the proposed HAC method to detect the time-dependent tumor location, several scenarios are studied in the mentioned model. Quantitative metrics of successfully reconstructed tumor (with a small radius of 7 mm) images prove the ability of the proposed imaging method for early-stage breast cancer detection.

Keywords

Confocal microwave imaging algorithmconformal arrayfocal pointshigh-accuracy calibration (HAC) methodhigh-resolution systemUWB microwave imaging system (UWB-MIS)
Type
Biomedical Applications
Information
International Journal of Microwave and Wireless Technologies , Volume 13 , Issue 4 , May 2021 , pp. 344 - 358
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Copyright
Copyright © Cambridge University Press and the European Microwave Association 2020

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