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微波辐射器在生物介质中近场辐射特性对腔道肿瘤热疗有重要实用意义 .根据电磁场理论模型和迭加原理 ,采用高斯积分法和辛普森积分法相结合 ,计算了水冷式双缝隙微波偶极子辐射器在生物介质中的比吸收率 (SAR)分布 ;分析了比吸收率分布随两缝隙间距变化的特征关系 .结果表明 ,适当选择缝间距离 (如等于 1/ 4～ 1/ 2波长 ) ,双缝辐射器不仅在径向 ,尤其在轴向可比单缝具有更为平坦的 SAR分布 ,从而可获得更大的有效治疗空间 .计算结果与相应的等效肌肉体模实验及热疗临床经验相符 ,将为腔道水冷式微波辐射器的研制设计和临床应用提供参考依据
Near-field radiation characteristics of microwave radiators in biological media have important practical significance for the hyperthermia of luminal tumors.According to the theoretical model and superposition principle of electromagnetic fields, Gaussian integration method and Simpson’s integral method are used to calculate the water-cooled double-slot microwave dipole The distribution of specific absorption rate (SAR) in biological media was analyzed. The distribution of specific absorption rate (SAR) with the change of spacing between two apertures was analyzed. The results show that the proper choice of the distance between the apertures (eg, equal to 1/4 to 1/2 wavelength ), The double-slit radiator not only in the radial direction, especially in the axial direction than the single slit with a more flat SAR distribution, so as to obtain more effective treatment space.Compared with the corresponding equivalent model test and hyperthermia Clinical experience, will provide a reference for the design and clinical application of cavity water-cooled microwave radiators