Comparative Studies on Mechanism of Heat Production by Ultra-short-wave and Microwave Diathermy

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• In this series of work, following possibilities with respect to the mechanism of heat production by ultra-short-wave and microwave diathermy were deduced from the physical and physico-chemical properties of high frequency current. Heating by ultra-short-wave and microwave may be induced by following three mechanisms:1) Heating due to abnormal energy absorption by a polar substance in the region near to its critical wave length, which is specific to each polar substance and is correlated with the volume of molecule, viscosity and temperature.2) Production of heat in accordance with Joule's law.3) Heating due to energy absorption probably induced by a kind of molecular movement in the milli-meter-wave region.These assumptions were also confirmed by measuring the elevation of temperature in components of human tissues by high-frequency currents. Ultra-short-wave (6m) in the electric field and in the electro-magnetic field and microwave (8.6mm and 12.5cm) were used in this experiment. From these studies, following conclusions as to the four methods of high-frequency diathermy were obtained.A) Heating by ultra-short-wave in the electric field: As wave length of 6m is near to the critical wave length of fat, fatty tissue is much more heated than highly water containing tissues, namely muscle or blood. It shows a difficulty of ultra-short-wave diathermy to heat deep tissues.B) Heating by ultra-short-wave in the electro-magnetic field: It is the merit of this method that it is capable of heating the conductive tissues such as muscular tissue and blood.C) Microwave (12.5cm): Heating by microwave (12.5cm) is mostly due to the abnormal energy absorption by water, therefore, it is possible with this method to heat the highly water containing deep tissues such as muscular tissue without excessive heating of the superficial layers.D) Heating by microwave (8.6mm): This method is not suitable to produce the deep heating beneath the subcutaneous fatty material. It is probably due to the absorption of milli-meter-wave by the superficial layers as described in mechanism 3).

• 一般社団法人 日本温泉気候物理医学会の論文

一般社団法人 日本温泉気候物理医学会 | 論文

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