TITLE:
Large Scale Analysis of Complex Permittivity of Breast Cancer in Microwave Band
AUTHORS:
Yoshihiko Kuwahara, Akira Nozaki, Kimihito Fujii
KEYWORDS:
Breast Cancer Detection, Microwave Imaging, Complex Permittivity, Debye Model
JOURNAL NAME:
Advances in Breast Cancer Research,
Vol.9 No.4,
September
15,
2020
ABSTRACT: 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.