多方向磁界を発生させる機能的ハイパーサーミア用コイル構成に関する検討

概要

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Hyperthermia is a cancer therapy that necrotizes cancerous tumors with heat. The soft-heating method is one type of hyperthermia implanting small elongated elements inside the body. The heat element consists of thermosensitive ferrite with a metallic ring. The element generates heat induced by a high-frequency magnetic field produced by the exciting coils. The most heat is generated when the elements major axis is parallel to the direction of the magnetic field, but the solenoidal and spiral coils may be excited in a nearly constant direction. It is difficult to heat the elements efficiently with these coils. Therefore, we need a coil construction that can excite the elements efficiently without having to depend on the direction of the heat elements. In this paper, we discuss a multicoil construction we examined to generate multidirectional magnetic fields. Our group advanced a method of reducing induced current that could drive safely even if it was electromagnetically-coupled. We also examined a therapeutic coil model with this method that had strong electromagnetic coupling. As a result, multidirectional magnetic fields could be generated by using the therapeutic model.