Breast cancer recognition by electrical impedance tomography implemented with Gaussian relaxation-time distribution (EIT–GRTD)

Setyawan, Galih; Sejati, Prima Asmara; Ibrahim, Kiagus Aufa; Takei, Masahiro

doi:10.2478/joeb-2024-0011

Abstract

The comparison between breast cancer recognition by electrical impedance tomography implemented with Gaussian relaxation time distribution (EIT-GRTD) and conventional EIT has been conducted to evaluate the optimal frequency for cancer detection f^cancer. The EIT-GRTD has two steps, which are 1) the determination of the f^cancer and 2) the refinement of breast reconstruction through time-constant enhancement. This paper employs two-dimensional numerical simulations by a finite element method (FEM) software to replicate the process of breast cancer recognition. The simulation is constructed based on two distinct electrical properties, which are conductivity σ and permitivitty ε, inherent to two major breast tissues: adipose tissues, and breast cancer tissues. In this case, the σ and ε of breast cancer σ^cancer, ε^cancer are higher than adipose tissues σ^adipose, ε^adipose. The simulation results indicate that the most effective frequency for breast cancer detection based on EIT-GRTD is f^cancer = 56,234 Hz. Meanwhile, conventional EIT requires more processing to determine the f^cancer based on image results or spatial conductivity analysis. Quantitatively, both EIT-GRTD and conventional EIT can clearly show the position of the cancer in layers 1 and 2 for EIT-GRTD and only layer 1 for conventional EIT.

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Breast cancer recognition by electrical impedance tomography implemented with Gaussian relaxation-time distribution (EIT–GRTD)

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