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医用同源双模中能电子直线加速管是影像引导放射治疗技术(Image Guide Radiation Therapy,IGRT)中的核心部件,为确保放射治疗直线加速器能够提供稳定和高品质的成像射束、双光子模式治疗射束以及多档电子射束,上海联影医疗科技有限公司研制了基于一种新型的能量开关技术的14 Me V医用双模驻波加速管。采用束流动力学程序Parmela对加速管整管的横向聚焦和纵向聚束进行了动力学设计分析,为优化加速管腔体几何结构提供了指标要求,最终利用电磁场仿真软件Superfish及CST(Computer Simulation Technology)优化腔体结构设计并得到了最优的微波参数。模拟计算结果表明,该加速管总长1.3 m,采用边耦合双周期?/2驻波结构,工作频率2.998 GHz,其输出束流能量可以实现多档可调,成像模式可输出低于3 MV的光子,治疗束可输出具有6 MV和10 MV两档的光子及4档能量电子束(最高能量可达14 Me V)。完成加工后,冷测结果与设计值符合得比较好,下一步将进行高功率微波老练。
Medical homology bimodal electron linear accelerometers are a central component of the Image Guide Radiation Therapy (IGRT). In order to ensure that the radiotherapy linear accelerator can provide a stable and high quality imaging beam, the two-photon mode Treatment beam and multi-file electron beam, Shanghai United Imaging Medical Technology Co., Ltd. has developed a 14 Me V medical dual-mode standing wave acceleration tube based on a new type of energy switching technology. The Beam dynamics program Parmela was used to analyze the lateral focusing and longitudinal bunching of the accelerating tube, which provided the index requirements for optimizing the geometrical structure of the accelerating tube cavity. Finally, using the electromagnetic field simulation software Superfish and CST (Computer Simulation Technology Optimize the cavity structure design and get the best microwave parameters. The simulation results show that the accelerating tube has an overall length of 1.3 m and a side-coupled 2/2 standing wave structure with an operating frequency of 2.998 GHz. The output beam energy can be adjusted in multiple steps and the imaging mode can output less than 3 MV The photon and therapy beam outputs photons in 2-steps at 6 MV and 10 MV and 4-beam energy at up to 14 MeV. After the completion of processing, cold test results in line with the design value is better, the next step will be sophisticated microwave power.