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Study on three dimensional thermal field of double implanted microwave radiation

LIANG Ping, DONG Baowei, YU Xiaoling, et al. Department of Ultrasound, PLA General Hospital, Beijing 100853  
Objective\ To observe three dimensional thermal distribution and temperature rise pattern of microwave radiation induced through double implanted microwave electrodes in coagulating liver cancer, to develop the calculating method with computer simulation in order to complete coagulate larger tumor at one stroke. Methods\ Based on thermal distribution of single electrode, the proper distance between two electrodes was determined by computer simulation at three kinds of power output (40 W 30 min, 50 W 10 min and 60 W 300 s). Above result was examined and correct through monitoring the temperature at 156 spots/times in 156 pork liver's tissue in vitro. Results\ Temperatures rise curve and coagulated area obtained from microwave radiation in the pork liver induced through the double electrodes coincided with value of computer simulation. Coagulated area was 6.0 cm×6.0 cm when the distance of 2.2 cm between two microwave electrodes at power output of 40 W 30 min. Coagulated area was 4.7 cm×5.3 cm when the distance of 1.6 cm between two microwave electrodes at power output of 50 W 10 min. Coagulated area was 3.9 cm×4.9 cm when the distance of 1.2 cm between two microwave electrodes at power output of 60 W 300 s. Conclusions\ A larger coagulate necrosis area was induced by inserting two microwave electrods simultaneously. It provides a technical basis for eliminate the liver cancer in situ at one stroke. Base on the interfere theory of thermal field and results of computer simulation, it is possible to simulate the complex thermal field with computer and to coagulate the irregular liver tumor in the feature.
【Fund】: 国家自然科学基金
【CateGory Index】: R-39
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