J2410105 Modeling of Heat Generation Value based on Electrical Impedance Frequency Characteristic under Radio-Frequency Ablation

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  • J2410105 ラジオ波焼灼療法における電磁波周波数特性に基づく発熱量のモデル化([J241-01]医工学テクノロジーによる医療福祉機器開発(1))

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Radio Frequency Ablation (RFA) is one kinds of hyperthermia treatment for cancer. Advantages of RFA are mainly low impact operations and shorter hospital stay. Disadvantage of RFA is difficult to get coagulation information for operator. Therefore, it needs to control ablation energy precisely. Thus, we have been proposed a method control of ablation energy. A feature of RFA, it uses electromagnetic-wave for ablation. RFA is related as not only thermal physics but also electrical physics. And, Heat generation from RF-electrode depends on frequency of electromagnetic-wave frequency. Therefore, in this study, we modeled heat generation based on electric impedance frequency characteristic during RFA. Firstly, it measured electric impedance frequency characteristic of pig liver samples. Secondly, it measured temperature distribution of the samples during RFA. Finally, it modeled electric impedance frequency characteristic of pig liver samples based on equivalent circuit model which was considered about fractional calculus. And, we evaluated a value of electrical impedance. From results, Model value of heat generation was matched with actual measurement value by using a coefficient of electrical impedance.

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