基于NPL初级标准质子热量计校准服务的质子疗法剂量计的IPEM行为准则
Stuart Green1,2, Ana Lourenço3,4, Hugo Palmans3,5
1Department of Medical Physics, University Hospital Birmingham NHS Trust, Edgbaston, Birmingham B15 2TH, United Kingdom.
Physics in medicine and biology
|January 22, 2025
概括
新的医学物理与工程研究所 (IPEM) 行为准则减少了临床质子束剂量计中的不确定性. 这种改进的方法使用初级标准石墨热量计,以更准确地测量水的吸收剂量.
科学领域:
- 医学物理 医学物理
- 辐射剂量计 辐射剂量计
- 质子疗法是一种治疗方法.
背景情况:
- 基于国际原子能机构TRS-398的临床质子束国际参考剂量计目前的相对标准不确定性为1.7% (k=1).
- 这种不确定性影响了在参考条件下对水的吸收剂量确定精度.
- 在质子疗法中存在需要更精确的剂量计方案.
研究的目的:
- 引入新的医学物理与工程研究所 (IPEM) 临床质子束参考剂量计实践准则.
- 显著降低吸收剂量的相对标准不确定性,以测量水.
- 为质子疗法设施提供可追溯和可靠的准确剂量计方法.
主要方法:
- 使用了由国家物理实验室 (NPL) 开发的便携式初级标准级石墨热量计.
- 执行了直接可追溯到临床质子束中NPL石墨热量计的参考剂量计测量.
- 在各种深度的水中,在定义的标准测试体积 (STV) 内的校准的电离室,使用Roos类型的室.
主要成果:
- 新的IPEM行为准则允许将相对标准不确定性降低到1.0% (k=1) 对于吸收剂量与水的相对标准不确定性.
- 这种方法消除了IAEA TRS-398方法所要求的光束质量校正因子 (kQ,Q0) 的需要.
- 主要的标准石墨热量计是强大的用于临床质子束在国内和国际上使用.
结论:
- 新的IPEM行为准则为临床质子束的参考剂量计准确性提供了显著的改进.
- 使用初级标准石墨热量计的直接校准提供了更准确的吸收剂量到水的确定.
- 这种方法提高了质子疗法治疗的可靠性和精度.
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