- 日本ハイパーサーミア学会誌 (ISSN:09112529)
- vol.8, no.2, pp.115-125, 1992
We investigated SAR (specific absorption rate) and temperature distributions produced by two different types of hexagonal array applicators. The array applicators were composed of coaxial-slot antennas used for microwave cancer therapy. One array applicator was made of 6 antennas which were placed at apexes of a hexagon. The other array consisted of 6 antennas at apexes and one at the center of the hexagon. The side of the hexagon was chosen to be 3 cm long. The 6-antenna array driven inphase at 430 MHz had a narrow region where the normalized SAR was more than 50%. This may cause a hot spot during hyperthermia treatments. The 7-antenna array driven in-phase provided wider and more uniform heating patterns. Temperature patterns calculated from the SAR patterns agreed well with experimental ones. Finally, we proposed 'heating volume' to evaluate the heating characteristics of the hexagonal arrays.