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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。 相似文献
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根据微波偶极子辐射模型和生物介质热传导方程,运用数值计算方法比较了微波偶极子辐射器在有、无水冷和不同冷却水温条件下生物介质中的有效加热体积(定义为温度在41~45℃范围的体积)。仿真研究表明,水冷可改善微波偶极子辐射热区温度分布,使其有效治疗体积比无水冷时增加(约39%)。降低冷却水温(例如从12℃降至4℃),则相应的有效治疗体积进一步增加(约33%)。若采取先用小功率、无水冷加热,后用大功率有循 相似文献
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Inverse Optimizing Method of Bio-Temperature-Field Reconstruction in rf-Capacitive Hyperthermia
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We propose an inverse optimizing method, used in rf-capacitive hyperthermia to obtain a certain target tumour temperature and to avoid the over-heating of normal tissues. Based on the finite-element-method solutions of the Laplace electric potential equation and Penne‘s bio-heat transfer equation, the heating conditions are modified by the genetic algorithms recursively to minimize the objective function for searching an optimum physical configuration. With a simplified human tissue model extracted from an x-ray computed tomography slice which has deep- and shallow-seated turnouts, satisfactory simulation results are obtained both on bi-plate and three-plate systems, e.g. The tumour temperature is higher than 43℃ and the temperature of normal tissues is lower than 39℃. It is suggested that the proposed algorithm is snitable for both shallow and deep seated cancer oncology. 相似文献
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热疗中热场(比吸收率和温度)分布形态是检验其装置优劣和能否获得较好疗效的主要依据,借助于计算机图形学,用模拟计算方法来预测热区的SAR和温度分布,以研究并优选加热场形态,对指导热疗装置的研制和临床热疗方案的选择有重要的实际意义。本文仅以腔道肿瘤热疗和射频容性势疗为例,介绍计算机 形学在肿瘤势疗的势场分布研究中的应用。 相似文献
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