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KMID : 0362919840020010011
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Journal of the Korean Society for Therapeutic Radiology and Oncology
1984 Volume.2 No. 1 p.11 ~ p.20
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Fabrication of Microwave Applicator for Hyperthermia and Thermal Distribution in Tissues
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Chu Sung-Sil
Lee Jong-Dae
Kim Gwi-Eon
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Abstract
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The renewed interest in the use of hyperthermia in cancer therapy is bases on radiobiological and clinical evidence indicated that there may be a significant therapeutic advantage with the use of heat alone or combined with radiation or chemotherapy.
There are many methods for generating heat for localized tumor as like radiofrequency, microwave, electromagnetic induction and ultrasound.
But it is very difficult to be even thermal dose distribution and stable output of power and then the detection of temperature in tumor is difficult to be precise with thermocouples and semiconducter sensors.
We designed the microwave heating generator, dipole antenna applicators and autometic temperature controlled thermocouples for localized hyperthermia on skin and in cavities.
1. The microwave generator with 120W, 2,450MHz magnetron could be heating up to 40℃∼50℃ for 1∼2 hours in living tissues.
2. The thermal dose distribution in tissue with microwave was described 42℃∼44℃ with in 3 cm depth and 2∼6 cm diameter area.
3. Skin surface heating applicator with spiral 3 times wave length antenna radiated high power of microwave.
4. Intracavitary heating applicator with dipole antenna with autometic control temperature sensor kept up continuously constant temperature in tissue.
5. For constant thermal distribution, applied two steps power with 10W microwave after 17∼20W during first 10 minutes.
6. The cooling rate by blood flow in living tissue was rised as 10% than meats.
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