Comparative Study on Cooling System Antenna versus Non-Cooling System Antenna in Multilayer Phantoms using Low Treatment Power

Micro-coaxial antennas have been studied as alternative treatments for different types of tumors. However, the damage to healthy tissue due to temperature rise in the antenna body is a problem that needs to be addressed to avoid the undesired heat in healthy tissue during clinical cases. To reduce the heating of the antenna body, the design of a cooling system that avoids damage to healthy tissue has been proposed. Moreover, this system allows the use of low input powers levels, i.e., lower than 20 W. Therefore, a cooling system, with circulating water (19°C) through the antenna body, was designed and built. This cooling system was tested in two micro-coaxial antennas, a monopole antenna, and a double slot antenna. The performing experiments were done in a multilayer phantom by using 10 W input power applied per 5 minutes. The results show a decrease of 6°C in healthy tissue and a power loss of 6.5% when the cooling system was used.