北京生物醫(yī)學工程

2450MHz水冷式微波消融天線比吸收率的實驗研究

Experimental Research on Specific Absorption Rate of Water-Cooled Microwave Antenna with 2450MHz in Ablation

作者：艾海明吳水才楊春蘭高宏建趙磊曾毅

單位：北京工業(yè)大學生命學院生物醫(yī)學工程中心（北京100124）

關鍵詞： microwave ablation; specific absorption rate; temperature field simulation

分類號：

出版年·卷·期（頁碼）：2011·30·1（39-44）

摘要：

探討2450MHz微波天線比吸收率（SAR）的空間分布規(guī)律，以掌握微波天線的加熱能力。以離體豬肝作為微波熱消融實驗對象，分別采用5組常用微波功率40W、50W、60W、70W和80W進行加熱，每組以40例樣本做熱消融實驗。實驗中，每例樣本被精確固定布放16個測溫針并且分別進行前向和后向測溫。結果表明，SAR前、后向分布具有非對稱性，從天線中心向四周有規(guī)律地衰減，并且SAR與加熱功率之間沒有線性關系，但數(shù)值隨著加熱功率增大而增大。近場點的溫度模擬結果與實測值具有較好的一致性，從而驗證了SAR檢測結果的準確性。因此，該實驗研究微波天線SAR分布的方法是有效的，SAR檢測結果可用于溫度場計算機模擬中的熱載荷。

In order to understand the heating ability of microwave antenna, the spatial distribution pattern of special absorption rate was explored with 2450MHz microwave antenna. Five-group ablated experiments with the heating power of 40W，50W，60W，70W and 80W were performed to in-vitro pig livers. Forty samples of thermal ablation were repeated for each group. In each test, sixteen thermometers were precisely located and the temperature measurements were performed both forward and backward directions. Experimental results demonstrated that the SAR were asymmetric in forward and backward directions and decreased regularly around from antenna center. There was no linear relationship between SAR and heating power however the value of SAR increased with the heating power. Based on good consistency between temperature simulation and the real temperature measurement, in the field near temperature center, the accuracy of the SAR examination was evaluated. In conclusion, experimental study of SAR distribution of microwave antenna is effective and detection results of SAR can be applied to thermal load in computer simulation of temperature field.

參考文獻：

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