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区别于大型加速器上对于束斑的定义与计算,医用电子直线加速器的束斑会影响剂量的X辐射分布(Profile)的半影区,从而影响放疗设备的治疗精度,对它的研究侧重点也不同于其它类型的加速器。基于这个原因,针对目前医用电子直线加速器尤其是国内医用电子直线加速器对电子束束斑计算与测量数据不够的问题,从束斑的理论计算出发,归纳了两种方法,并进行了对比研究。在理论研究的基础上,对上海联影医疗有限公司的6 Me V医用电子直线加速器的束斑进行了实验测量,采用两种高斯分布叠加拟合实验数据以得到较好的精度,对实验中的系统误差进行了分析,与理论计算较为吻合。
Differing from the definition and calculation of beam spot on a large accelerator, the beam spot of a medical electron linear accelerator will affect the penumbra of the dose X radiation profile, thereby affecting the therapeutic accuracy of the radiotherapy equipment. Its research emphasis is also Unlike other types of accelerators. For this reason, in view of the problem that the medical linear accelerator, especially the domestic medical electron linear accelerator, is not enough to calculate and measure the electron beam spot, the two methods are summarized and compared from the theoretical calculation of the beam spot. Based on the theoretical study, the beam spot of 6 Me V medical linear accelerator of Shanghai United Imaging Co., Ltd. was experimentally measured. Two kinds of Gaussian distribution were used to fit the experimental data to obtain the better accuracy. In the experiment The systematic error is analyzed, which is in good agreement with the theoretical calculation.