Summary
International Symposium on Antennas and Propagation
2010
Session Number:2WC1
Session:
Number:2WC1-15
Heating Performance of Loop Antenna for Microwave Thermal Therapy by Combination of HIFU Treatment System
Samon Ishikawa, Kazuyuki Saito, Masaharu Takahashi, Koichi Ito,
pp.-
Publication Date:2010/11/23
Online ISSN:2188-5079
Summary:
In recent years, tumour treatment systems which employ high-intensity focused ultrasound (HIFU) technology have been studied [1], [2]. One of those systems has transducers in the water tank installed in the center of the bed. Then it radiates ultrasound focusing on the cancer cells and heats them. This system can generate precise heated region, but has difficulty in generating large one. On the other hand, external heating system using microwave techniques can make large heated region around the surface of skin. Therefore we propose a new treatment system combining two methods mentioned above. Figure 1 shows the combined system. It can treat wide superficial tumor such as skin tumour. The HIFU heats marginal part of tumour and electromagnetic (EM) wave heats large part near surface at the same time. Even if two treatment systems are not simultaneously used, one device having two treatment systems will be beneficial in cost and place to set up devices on. In order to realize this system, we have been developing microwave antenna which can be used with transducers in the water tank. The antenna is required to work in the water and not to interfere the HIFU treatment. Therefore we adopt circular loop antenna, which is intended to be set over the transducers so that ultrasound can travel through the hole of the antenna. In this study, specific absorption rate (SAR) and temperature distributions of muscle due to circular loop antenna with model based on a real therapeutic situation except transducer were numerically calculated.