More than 10 years experience of beam monitoring with the Gantry 1 spot scanning proton therapy facility at PSI
More than 10 years experience of beam monitoring with the Gantry 1 spot scanning proton therapy facility at PSI
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DOI：
10.1118/1.3244034
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发表时间：
2009-11-01
期刊：
影响因子：
3.8
通讯作者：
Pedroni, Eros
中科院分区：
文献类型：
--
作者：
Lin, Shixiong;Boehringer, Terence;Pedroni, Eros
目的：为第一台PSI点扫描质子治疗设备Gantry 1开发的束流监测设备已成功使用10多年。本文的目的是总结作者在动态质子扫描束流监测技术方面的经验。方法：点剂量输送和验证使用两个独立的束流监测和计算机系统。在本文中，详细描述了探测器的构造、电子系统、剂量测定和质量保证结果。光束通量监测器用法拉第杯校准。通过在施加光斑前用霍尔探头测量偏转磁体的磁场，并在光斑传送后用电离条室检查射束位置和宽度来实现束位置监测。结果：顶针电离室剂量测量的结果是可重复的（平均偏差小于1％，标准偏差为1％）。光束位置测量的分辨率约为十分之一毫米。扫描过程中光束位置传输和监控的公差小于 1.5 mm。结论：Gantry 1 的成功运行所获得的经验为开发新系统 Gantry 2 提供了独特而坚实的背景，以执行新的先进扫描技术。 (C) 2009 年美国医学物理学家协会。 [DOI：10.1118/1.3244034]
Purpose: The beam monitoring equipments developed for the first PSI spot scanning proton therapy facility, Gantry 1, have been successfully used for more than 10 years. The purpose of this article is to summarize the author's experience in the beam monitoring technique for dynamic proton scanning.Methods: The spot dose delivery and verification use two independent beam monitoring and computer systems. In this article, the detector construction, electronic system, dosimetry, and quality assurance results are described in detail. The beam flux monitor is calibrated with a Faraday cup. The beam position monitoring is realized by measuring the magnetic fields of deflection magnets with Hall probes before applying the spot and by checking the beam position and width with an ionization strip chamber after the spot delivery.Results: The results of thimble ionization chamber dosimetry measurements are reproducible (with a mean deviation of less than 1% and a standard deviation of 1%). The resolution in the beam position measurement is of the order of a tenth of a millimeter. The tolerance of the beam position delivery and monitoring during scanning is less than 1.5 mm.Conclusions: The experiences gained with the successful operation of Gantry 1 represent a unique and solid background for the development of a new system, Gantry 2, in order to perform new advanced scanning techniques. (C) 2009 American Association of Physicists in Medicine. [DOI: 10.1118/1.3244034]