The Performance of Sensitivity-Maps Method in Reconstructing Low Contrast and Multi-Contrast Objects for Microwave Imaging Applications

Basari; Syahrul  Ramdani

doi:10.3991/ijoe.v19i08.38665

Authors

Basari Biomedical Engineering, Faculty of Engineering, Universitas Indonesia https://orcid.org/0000-0002-5608-0893
Syahrul Ramdani Universitas Indonesia

DOI:

https://doi.org/10.3991/ijoe.v19i08.38665

Keywords:

image reconstruction, inverse scattering, microwave imaging, multifrequency imaging, sensitivity-maps

Abstract

The microwave imaging system for breast tumor/cancer detection requires high sensitivity to detect abnormal tissue that has little contrast in high-density breasts. This paper proposes a qualitative microwave imaging system simulation based on inverse scattering using the sensitivity-maps method. This method utilizes two measurement types for system calibration: a reference object as a scatterer-free background and a calibration object to obtain the system's impulse response. The object under test (OUT) consists of an object with low dielectric contrast and a phantom with multiple low dielectric contrasts (multi-contrast). Reconstruction is carried out on three types of S-parameter measurement data, namely S_11,〖 S〗_21, and a combination of both. S-parameters are measured at several frequencies, which are 3, 10, 14, 15, 16, 20 GHz, and the combination of all those frequencies (multifrequency). Reconstructed images show that the system is capable of reconstructing dielectric objects accurately. Quantitatively, the results show that the multifrequency S_21 measurement yields the best image quality with relative root mean squared error (RRMSE) values of 0.1272 and structural similarity index (SSIM) of 0.9076. The designed imaging system also successfully reconstructs multi-contrast phantom accurately with RRMSE of 0.1434 and SSIM of 0.4609.

Author Biography

Basari, Biomedical Engineering, Faculty of Engineering, Universitas Indonesia

Basari (IEEE member S’05, M'12) was born in Tegal City, Central Java, Indonesia, in November 1979. He received his Bachelor of Electrical Engineering from Universitas Indonesia in 2002, Master of Engineering and Doctor of Engineering from Chiba University, Japan in 2008 and 2011, respectively. He worked at Indosat and Telkomsel for 2 years as an engineer in the Radio Network Planning and Radio Network Operation, respectively. Currently, Dr. Basari is a Permanent Faculty Member at the Faculty of Engineering, Universitas Indonesia since 2012 and a Researcher at the Research Center for Biomedical Engineering, Universitas Indonesia since its inception in 2016. Fields of interest in research include biomedical engineering (medical devices for informatics, diagnosis and therapy), medical imaging, MRI, artificial intelligent applications for healthcare and wireless/wearable medical systems. He has published his scientific writings in more than 148 articles in proceedings and scientific journals. He also owns 1 Granted Patent, 4 Licensed Intellectual Properties (1 Patent, 1 Copyright, 1 Circuit Design and Layout, and 1 Industrial Design), and 4 Registered Patents.

Basari joins several scientific communities in the field of science such as the IEEE (Institute of Electrical and Electronics Engineers), the Association of Indonesian Biomedical Engineering Program Institutions (AIPTBI), the Association of Indonesian Biomedical Engineers (PATBI), Indonesian Hospital Engineering Association (PTPI) and the Indonesian Engineers Association (PII).

Dr. Basari is the Head of the Biomedical Engineering Programs at Universitas Indonesia (Master and UG Program), Editor in Chief of the Makara Journal of Technology, Universitas Indonesia, from 2018-now; was the Head of the IEEE MTT/AP-Society Indonesia Section Chapter for 2018, 2019 and 2020,
Basari has experiences in organizing international scientific conferences include being the General Chair of the 2016 International Symposium on Biomedical Engineering (ISBE); Vice Chair of the 2018 Indonesia Japan Joint Scientific Symposium (IJJSS), Vice Chair of the 2019 Indonesia-Japan Workshop on Antennas and Wireless Technology (IJAWT), and General Chair of the 2019 IEEE Region 10 (Asia-Pacific) Humanitarian Technology Conference (R10 HTC). Basari is also a reviewer in several international conferences and journals in the fields of Engineering, Electrical Engineering and Biomedical Engineering.

Dr. Basari has received several awards such as 2010 IEEE AP-Society Japan Chapter Young Engineer Award, 2011 Best Doctoral Graduate of Chiba University-Japan, 2013 APRASC-URSI Young Scientist Award, 2015 QiR Best Paper Award, and 2020 Engineering Dean Award (Research for Covid-19 Category).
One of the research products that has been commercially available in market is the COVENT-20 Ventilator, cooperated with Bartec Utama Mandiri Corp (local Indonesian medical device company). He is still conducting research on other medical devices with his team for the sake of medical device products in Indonesia. A few to state such as syringe/infusion pumps, portable microwave imaging scanners for cancer detection, electrical impedance tomography (EIT) for patients' lungs monitoring, wireless wearable devices, and minimally invasive thermal therapy methods.