通过对FLASH有效剂量进行剂量修改因子建模,同时优化剂量和剂量速率
Jiangjun Ma1, Yuting Lin2, Min Tang1
1Institute of Natural Sciences and School of Mathematics, Shanghai Jiao Tong University, Shanghai, China.
这项研究引入了一种新的质子FLASH放射治疗规划方法,SDDRO-DMF,它优化FLASH有效剂量 (FED) 以改善风险器官节省. 该方法成功地减少了对器官的高剂量体积,证明了其在晚期癌症治疗中的有效性.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 辐射疗法优化的优化
背景情况:
- 闪光照射疗法 (FLASH) 通过闪光效应提供了通过闪光效应改善风险器官 (OAR) 的节省.
- 物理剂量覆盖和生物FLASH覆盖之间存在一个权衡,需要FLASH有效剂量 (FED) 概念.
- 与传统放射治疗 (CONV) 相比,FED量化了FLASH的净改善.
研究的目的:
- 开发一种新的治疗规划方法,同时通过剂量修饰因子建模 (SDDRO-DMF) 来优化剂量和剂量速率,用于质子FLASH.
- 使用SDDRO-DMF直接优化FED用于质子FLASH处理.
主要方法:
- 使用FLASH剂量修改因子 (DMF) 模型,包括现象学 (FEM) 和机理学 (ROD) 方法,SDDRO-DMF模型和优化FED.
- 该框架展示了使用传输束或布拉格峰的质子FLASH的一般适用性,具有单个或多场辐射.
- 一种代凸放松方法可以解决反向优化问题.
主要成果:
- 与强度调节质子疗法 (IMPT) 和最先进的方法 (SDDRO) 相比,SDDRO-DMF得到了验证.
- 该方法在减少高剂量和高剂量OAR的量方面表现出有效性.
- 在肺部SBRT病例中,SDDRO-DMF满足了严格的骨剂量约束,并消除了CTV10mm的高剂量体积.
结论:
- 提出了一种新的质子FLASH优化方法,SDDRO-DMF,使用DMF模型直接优化FED.
- 与IMPT和SDDRO相比,SDDRO-DMF在降低高剂量OAR体积和/或价值方面表现出有效性.
- 这种方法在优化FLASH放射治疗计划方面取得了重大进展.
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