Abstract
Most liver tumors are non-surgical and require other treatments. Another non-surgical treatment for these tumors is the microwave technique. In this study, heat distribution and destruction of cancerous tissue in the liver using microwaves have been studied numerically. For this purpose, a microwave-generating antenna is used which is inserted into the position. By generating waves, the tumor cells become very hot and die. This procedure is performed to treat small liver lesions. It is sometimes used as a complementary treatment after surgery or chemotherapy. Frequency and power change in ranges 1.45 GHz ≤ f ≤ 8.45 GHz and 10 W ≤ P ≤ 40 W, respectively. The governing equations are solved with the help of the finite element method (FEM). Temperature distribution, degradation factor, specific absorption rate (SAR), and current density (due to the magnetic field) parameters are obtained at various frequencies and powers. The results show that each frequency has its performance so that low frequencies are more suitable for teardrop-shaped tumors or elongated appendages and high frequencies are more suitable for spherical-shaped tumors in deep areas. Besides, the destruction rate at higher frequencies is slower, but the process can be greatly increased by using high power. The highest local SAR occurs at 4.45 GHz.
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