Author(s)

Yoshihiko Kuwahara^1*, Akira Nozaki¹, Kimihito Fujii²

¹Department of Electric and Electronical Engineering, Faculty of Engineering, Shizuoka University, Hamamatsu, Japan.
²Division of Breast and Endocrine Surgery, Department of Surgery, Aichi Medical University, Nagakute, Japan.

To obtain some prior knowledge of breast cancer detection by microwave imaging, we have measured and analyzed the complex permittivity of tissues extracted from over 140 breast cancer surgeries. The relative permittivity and conductivity of tumor at 1.6 GHz were 17.5% and 16.2% higher than those of mammary gland tissue, respectively. In invasive ductal carcinoma of scirrhous type, 8 out of 64 had higher relative permittivity and conductivity of mammary gland than those of tumor. However, when evaluated by the Debye parameter considering the frequency dependence of the tissue, it is rare that ε_∞ and Δε of cancer are simultaneously lower than those of mammary gland. The relative permittivity and conductivity of fibroadenoma are almost the same as those of mammary glands. The relative permittivity and conductivity of each tissue showed strong linearity. Microwave imaging requires accurate reconstruction of ε_∞ and Δε to distinguish cancer from normal tissue.

Breast Cancer Detection, Microwave Imaging, Complex Permittivity, Debye Model

Kuwahara, Y. , Nozaki, A. and Fujii, K. (2020) Large Scale Analysis of Complex Permittivity of Breast Cancer in Microwave Band. Advances in Breast Cancer Research, 9, 101-109. doi: 10.4236/abcr.2020.94008.