技术说明:生产超高剂量率电子的线性加速器投入使用
Ashley J Cetnar1, Sagarika Jain1, Nilendu Gupta1
1Department of Radiation Oncology, James Cancer Hospital and Solove Research Institute, The Ohio State University, Columbus, Ohio, USA.
Medical physics
|December 30, 2023
概括
研究人员委托瓦瑞安公司 (Varian) 进行研究.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 加速器物理学的物理学
背景情况:
- 超高剂量速率 (UHDR) 辐射显示为推进放射治疗的前景.
- 探索新的技术,以提高治疗效率和患者的治疗结果.
研究的目的:
- 委托Varian的研究闪光扩展器 (FLEX) 转换一个Clinic用于UHDR电子输送.
- 建立一个UHDR电子束生成和表征的平台.
主要方法:
- 使用了一台Varian Clinac iX与FLEX转换用于16 MeV UHDR (16H) 电子束生产.
- 优化了硬件,电子枪,射频电源和转向线圈,以实现最大的光束电流.
- 使用放射性染色膜进行了概况和百分比深度剂量 (PDD) 测量,比较了16H和16MeV常规电子 (16C).
- 使用高级马库斯电离室评估每脉冲剂量 (DPP),剂量速率,线性和稳定性.
主要成果:
- 根据PDD测量,16H和16C光束的质量相似.
- 在61.3厘米的SSD.SSD时,达到3.4 Gy的最大DPP和8.1E5 Gy/s的瞬间剂量速率.
- 测量FWHM为7.2厘米在61.3厘米的SSD和10.5厘米在100厘米的SSD.
- 证明了线性机器输出 (R=1) 和出色的稳定性 (±1%在会话内,±2%每天).
结论:
- 通过FLEX转换成功生成可重复的UHDR电子束,其性能与16 MeV常规电子相提并论.
- 该平台在UHDR和常规模式之间的快速 (<1分钟) 过渡对未来的研究有利.
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