使用日志文件确定最佳的点位递送模式 在笔光束扫描参考剂量计中的衍生剂量差异因子.
Kah Seng Lew1, Calvin Wei Yang Koh2, Kang Hao Lee2
1Division of Radiation Oncology, National Cancer Centre Singapore, Singapore; Division of Physics and Applied Physics, Nanyang Technological University, Singapore.
概括
优化笔光束扫描传递模式可以最大限度地减少参考剂量计中的剂量差异. 一个日志文件分析确定了Y快速扫描 (50MU) 作为最优的模式,准确的测量.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 剂量测量方法 剂量测量方法
背景情况:
- 在笔束扫描系统的参考剂量计测量过程中,点位定位的空间不确定性会导致参考剂量计曲线的波动.
- 准确的参考剂量测量对于确保有效和安全的放射治疗至关重要.
研究的目的:
- 开发一种方法来确定参考剂量计测量的最佳输送模式.
- 使用日志文件信息量化因点位错误引起的预期剂量差异.
主要方法:
- 交付了7种不同的交付模式,每个交付5次,收集每次交付的日志文件.
- 引入了一种用笔光束算法计算的剂量差异因子 (DDF) 和来自日志文件的实际点位.
- 量化DDF的A型和B型不确定性,以确定最优的交付模式.
主要成果:
- 在某些交付模式下,观察到高达2%的相对剂量差异.
- 在DDF和测量剂量比率之间发现了中等相关性 (R2=0.56).
- 配送模式与重新涂料和X快速扫描 (50MU) 显示了最低的平均不确定性,而Y快速扫描 (50MU) 被确定为最优的模式与最小的差异.
结论:
- 输送模式对参考剂量计测量有重大影响.
- 基于日志文件的方法可以确定最佳的交付模式,以尽量减少现场定位错误.
- 这种方法提高了笔光束扫描系统中参考剂量计的准确性和可靠性.
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