Microwave Imaging for Breast Cancer Detection: The Discrimination of Breast Lesion Morphology

Abstract

Radar based microwave imaging system is proposed and used for breast cancer detection. Tumour location can be detected based on high dielectric differences between tumour and surrounding tissues. In clinical medicine, malignant tumour usually has more irregular morphology than benign tumour. However, previous work has ignored the discrimination between benign and malignant tumours, and this issue is solved in our work. In this paper, two major novel contributions are presented. Firstly, a complex natural responses (CNRs) method is proposed for discrimination between the benign and malignant tumours. The CNRs of the tumour show a unique feature that the CNRs only depend on the morphological appearance of the tumour. Simulation results show that the use of the CNRs can successfully discriminate between a 5 mm radius spherical benign tumour and a 5 mm average radius malignant tumour with a spiculated periphery. Secondly, microwave images of the benign and malignant tumours are created by a proposed mono-static imaging system which uses a single Vivaldi antenna to scan the breast. Both benign and malignant tumour positions can be correctly indicated from the images.

Resolution improvement using enriched Krylov subspace for microwave tomography breast imaging system

“…A and b δ are the measurement matrix and error perturbed scattered field (b δ ¼ E s M þ ἠ ) noted in Equation ( 4). In the present, the Krylov subspace method called Enriched-CGLS with external penalization method 32 has been taken as the base method to solve Equation (6). It is an enhanced version of the CGLS method.…”

“…Women between the age of 35-40 face common breast changes such as inflammation, fibroadenoma, micro, and macro calcification which are non-cancerous, but, there is a high risk of women getting cancer with very dense breasts. 3,4 Microwave Tomography Imaging System (MWTIS) has achieved greater advancements in the field of breast cancer detection 5,6 and monitoring, 7,8 due to its harmless and redundant screening process. MWTIS is highly capable to acquire the details that represent the dielectric values (permittivity and conductivity) of fat, fibrogland tissues, and malignant tumors in the breast compared to other conventional imaging systems like X-ray mammography, Magnetic Resonance Imaging, and Ultrasound.…”

Dual-Functional Ultrawideband Antenna With High Fidelity Factor for Body Area Networks and Microwave Imaging Systems

“…27 shows that our via-fed antenna structure yields the malignant tumor's image accurately at the expected location with relatively insignificant clutter content. Compared with [28], 40 percent smaller malignant and benign tumors are detected through our proposed via-fed antenna.…”

“…2, the second antenna presented in [16], and Ant. 3, (2) we examined the detection of a malignant tumor model presented in [28], and located at P, with a 40 percent reduction in the average radius. The benign and malignant tumors are shown in Fig.…”

“…Also, our proposed via-fed antenna has been tested in BAN applications, and thus the multi-function capability has been confirmed. [28] utilizes a complex natural responses (CNRs) method to discriminate between benign and malignant tumors. A 10mm spherical benign tumor and a 10-mm average diameter malignant tumor are detected by a mono-static imaging system that uses a single Vivaldi antenna.…”