Influence of the surrounding tissues in the radiation pattern of microcoaxial antenna for the treatment of breast tumors

This paper presents a model of microwave radiation into the surrounding tissues in the therapy of ablation of breast using the finite element method (FEM). Three designs of antennas with different diameters have been proposed to carry out simulations with the surrounding tissues: adipose tissue, connective and glandular tissue and tumor tissue. The tissues of the breast should be considered in the study of the effectiveness of the antennas to observe the change of patterns of the Specific Absortion Rate (SAR). The FEM provides information for designing of microcoaxial antennas and its effects. The antennas of 0.95 and 1.3 mm of diameter have a Standing Wave Ratio (SWR) lower than the antenna with a diameter of 2.30 mm, so the smaller diameter antennas have a better response to a depth of 50 mm with a SWR of 1.5.