Development of a simple control system for uniform proton dose distribution in a dual-ring double scattering method
Development of a simple control system for uniform proton dose distribution in a dual-ring double scattering method
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DOI：
10.1088/0031-9155/51/5/014
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发表时间：
2006-03-07
影响因子：
3.5
通讯作者：
Ogino, T
中科院分区：
文献类型：
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作者：
Nishio, T;Kataoka, S;Ogino, T
在高聚焦照射肿瘤的质子放射治疗中，获得剂量分布高度均匀的治疗束是非常重要的。采用双环双散射法可以获得临床照射野内均匀的剂量分布。由于没有辐照分布的时间结构，该方法优于利用质子束电磁偏转的摆动法。然而，在双环二次散射法中，入射质子束进入散射体的条件，特别是入射质子束相对于散射体位置的精度，对束流在辐照场内分布的均匀性有很大的影响。在这项研究中，为了确保治疗过程中剂量分布的均匀，我们开发了一种控制系统，该系统配备了自动微调束轴和机构，以移动双散射的第二个双环散射到最佳位置。利用该系统，我们实现了质子放射治疗照射野剂量分布的均匀，对称性在+/-1%以内，平坦度在2%以内。
In proton radiotherapy with high focusing of irradiation on the tumour, it is important to obtain treatment beams with a highly uniform dose distribution. Uniform dose distribution in the clinical irradiation field can be obtained by the dual-ring double scattering method. This method is superior to the wobbler method, which uses electromagnetic deflection of the proton beams, because of the absence of the temporal structure of irradiation distribution. However, in the dual-ring double scattering method the condition of incident proton beams entering the scatter, especially the accuracy of the position of the incident proton beams with respect to the scatter, markedly affects the uniformity of the beam distribution in the irradiation field. In this study, to ensure the uniformity of dose distribution during treatment, we developed a control system equipped with an automatic fine adjustment of the beam axis and a mechanism for moving the second dual-ring scatter of the double scatters to the optimal position. Using this system, we achieved uniform dose distribution in the irradiation field during proton radiotherapy, with symmetry within +/- 1% and flatness within 2%.