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The coaxial-slot antenna is one of the applicators for interstitial microwave hyperthermia. The authors et al. have been developing the antenna to find the proper structural parameters to the clinical application, by means of the phantom experiment and the computer simulation. We have studied heating characteristics (SAR distributions) only in the homogeneous medium whose electrical properties are the same as the muscle tissue. In this paper the numerical analysis of the antenna in the multilayer media (skin-fat-muscle) is described. To calculate the heating characteristics in such complicated structure, the FDTD (Finite Difference Time Domain) method has been introduced. At first the validity of the analysis model of the antenna was confirmed by comparing the experimental results with the FDTD-calculated ones. Then the heating characteristics of one antenna were studied in the three-layered media, which is a more realistic modeling on the actual human body. In these results, the heating characteristics of the antenna in the three-layered media were showed significant difference from the ones in the homogeneous medium, especially in the region near the antenna insertion point. Next, the heating characteristics of a four-element array applicator in the three-layered media were calculated. From the results, it was revealed that the hot spot near the antenna insertion point was suppressed and the SAR distributions in the three-layered media were not only different in shape at the antenna insertion points from the ones in the homogeneous medium, but also were different in another regions. In conclusion, it is clarified by using the FDTD analysis method for calculation, that the effect of the skin and fat layer should be considered to some extent on the evaluation of the heating characteristics of the coaxial-slot antenna as well as an array applicator.

Heating Characteristics of Coaxial-Slot Antenna for Interstitial Microwave Hyperthermia in the Multilayer Media.