Performance of the NIRS fast scanning system for heavy-ion radiotherapy
Performance of the NIRS fast scanning system for heavy-ion radiotherapy
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DOI：
10.1118/1.3501313
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发表时间：
2010-11-01
期刊：
影响因子：
3.8
通讯作者：
Noda, Koji
中科院分区：
文献类型：
--
作者：
Furukawa, Takuji;Inaniwa, Taku;Noda, Koji
目的：一个建设新治疗设施的项目已经启动，作为现有HIMAC设施的延伸，以进一步发展近红外光谱的碳离子治疗。这个新的处理设施配备了铅笔束扫描的三维辐照系统。本课题的挑战在于如何实现对运动目标的扫描辐照处理。为了在可接受的照射时间内实现快速重新扫描，作者开发了一种快速扫描系统。方法：为了验证设计的有效性，并在新处理设施使用前演示快速扫描的性能，开发了一种新的扫描辐照系统，并将其安装在现有的HIMAC物理实验课程中。作者在(1)快速扫描磁体及其电源，(2)高速控制系统，(3)波束监测方面做出了很大的努力。利用HIMAC加速器的碳束对系统的三维剂量构象进行了测试。结果：通过波束试验验证了快速扫描系统的性能。扫描光束位置的精度小于垂直0.5 mm。通过配合规划软件，验证了垂直方向3%范围内的交付场均匀性，实现了三维交付。该系统只花了20秒就将1 Gy的物理剂量传递到直径为60 mm的球形目标上，并进行了8次扫描。在本试验中，点位停留时间的平均值大幅降低至154 μ s，最小停留时间为30 μ s。结论：本研究验证了新型扫描给药系统与规划软件相结合，可以准确地产生靶体的三维剂量分布。(C) 2010年美国医学物理学家协会。(DOI: 10.1118/1.3501313)
Purpose: A project to construct a new treatment facility, as an extension of the existing HIMAC facility, has been initiated for the further development of carbon-ion therapy at NIRS. This new treatment facility is equipped with a 3D irradiation system with pencil-beam scanning. The challenge of this project is to realize treatment of a moving target by scanning irradiation. To achieve fast rescanning within an acceptable irradiation time, the authors developed a fast scanning system.Methods: In order to verify the validity of the design and to demonstrate the performance of the fast scanning prior to use in the new treatment facility, a new scanning-irradiation system was developed and installed into the existing HIMAC physics-experiment course. The authors made strong efforts to develop (1) the fast scanning magnet and its power supply, (2) the high-speed control system, and (3) the beam monitoring. The performance of the system including 3D dose conformation was tested by using the carbon beam from the HIMAC accelerator.Results: The performance of the fast scanning system was verified by beam tests. Precision of the scanned beam position was less than perpendicular to 0.5 mm. By cooperating with the planning software, the authors verified the homogeneity of the delivered field within perpendicular to 3% for the 3D delivery. This system took only 20 s to deliver the physical dose of 1 Gy to a spherical target having a diameter of 60 mm with eight rescans. In this test, the average of the spot-staying time was considerably reduced to 154 mu s, while the minimum staying time was 30 mu s.Conclusions: As a result of this study, the authors verified that the new scanning delivery system can produce an accurate 3D dose distribution for the target volume in combination with the planning software. (C) 2010 American Association of Physicists in Medicine. [DOI: 10.1118/1.3501313]