快速切换C系列线性加速器在传统和超高剂量速率研究模式之间,采用光束线修改和输出稳定
Austin Sloop1, M Ramish Ashraf1, Mahbubur Rahman1
1Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire.
概括
研究人员开发了一种稳定的超高剂量率 (UHDR) 电子束,用于FLASH辐射治疗. 该系统能够快速切换常规和UHDR模式,实现实验性治疗的高剂量率.
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:
- 闪光辐射疗法需要超高剂量率 (UHDR) 电子束.
- 传统的线性加速器需要为UHDR光束生成进行修改.
- 在临床转换中,快速可靠地切换光束模式至关重要.
研究的目的:
- 配置C系列线性加速器,以快速切换传统和UHDR电子束.
- 为FLASH辐射疗法建立一个稳定可靠的UHDR光线.
- 为了在实验FLASH应用中实现一致的剂量递送.
主要方法:
- 修改了C系列线性加速器,用于双模式操作 (传统和UHDR).
- 实现了一个快速 (在2分钟内) 在电子束模式之间切换的系统.
- 使用脉冲计数系统和定制剂量计,用于精确的束控制和测量.
- 收回了用于UHDR电子束生产的X射线目标.
主要成果:
- 在同位中心实现了稳定的UHDR电子束,平均剂量速率为432 Gy/s.
- 成功地限制了脉冲超速,并消除了升级时间.
- 证明可靠的转换没有机器停机时间超过一年.
- 使用Gafchromic薄膜和脉冲对脉冲剂量计测量了光束配置.
结论:
- 稳定的10 MeV UHDR电子束已成功生成用于FLASH辐射疗法.
- 开发的系统可以通过可靠的脉冲计数系统来实现一致的剂量输送.
- 该配置支持各种实验参数,促进未来FLASH疗法的临床转化.
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