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| Analysis of Heating Mechanisms and Calculation of Temperature Rising Rate for Human Tissues in Radiofrequency Capacitive Hyperthermia |
| School of Physics and Electronics, Hunan University, Changsha 410082, China |
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Abstract The purpose of this study is to clear up some misunderstandings in the heating mechanisms and in the temperature rising rate of different human tissues in radiofrequency (RF) capacitive hyperthermia. In this paper, the mechanisms of heating human tissues by RF capacitive hyperthermia are studied
on the basis of electromagnetic field theory. According to the model of neglecting fringing effect of plate electrodes in which filled with different dielectric layers, the expressions of the ratios of power loss per unit volume, specific absorption rate (SAR), and temperature rising rate for any two dielectrics were derived. Substituting the known electrical parameters and physical parameters of human muscle, fat and cortical bone into those expressions, we found that the temperature rising rate of fat and bone was 18.9 and 20.2 times as many as that of muscle at 27.12 MHz, while 19.8 and 19.1 times at 40.68 MHz. We concluded that in RF capacitive hyperthermia process, the larger the conductivity of human tissue, the smaller the temperature rising rate. And the temperature rising rate for different tissue is very inhomogeneous in RF capacitive hyperthermia.
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