Microwave near-field effects and characterizations for noninvasive breast cancer treatment

In this paper, a circular conformal radiation system is considered for the quadrant breast cancer therapy. A toroidal conformal antenna is proposed for nipple area breast cancer therapy. The specific absorption rate (SAR) values in the breast model are analyzed based on simulated results using finite element method (FEM) in HFSS software. Different sizes of toroidal antennas are assumed in simulations to find the best focusing effects in the tumor region. By comparing various simulation results, it is concluded that focusing effects in tumor region vary with sizes of antennas. At the same time, a preliminary biomedical system is proposed for adaptive therapy of breast cancer tumors with arbitrary positions. The high treatment efficiency is achieved by varying feeding signal phases on the two antenna patches for different beam scanning.