基于日志文件的呼吸道门系统质量保证方法
Wonjoong Cheon1, Young Kyu Lee1, Yunji Seol2
1Department of Radiation Oncology, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea.
Journal of applied clinical medical physics
|April 8, 2025
概括
这项研究引入了一种基于日志文件的质量保证 (QA) 方法,用于呼吸门辐射治疗. 新的质量保证方法确保了辐射输送和瘤运动之间的准确同步,提高了患者的安全性.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 质量保证 质量保证 质量保证
背景情况:
- 医疗线性加速器的进步使得更高的剂量速率可提供,增加了低分离方案的使用.
- 低分离需要强大的呼吸门系统来与瘤运动同步辐射输送.
- 有效的质量保证 (QA) 对于确保治疗准确性和患者在封闭放射治疗中的安全至关重要.
研究的目的:
- 提出和评估一种新的基于日志文件的质量保证方法,用于呼吸门辐射疗法.
- 通过日志文件分析评估呼吸门系统和处理机器的准确性和可重复性.
- 建立一个高效和客观的质量保证程序,用于封闭式辐射疗法.
主要方法:
- 在4DCT扫描中使用了Varian运动幻影和呼吸门扫描仪 (RGSC).
- 制定了一项治疗计划,其中包括特定的呼吸阶段 (25%-75%),并将其交付给一个幻影.
- 利用内部软件进行时间同步评估,提取和分析治疗日志 (呼吸信号,光束标志).
- 用离子室进行输出测量,并获得EPID图像,用于剂量计准确性和光束传递时间的验证.
主要成果:
- 对日志文件的分析表明,呼吸阶段和光束触发器之间的时间同步是精确的 (平均时间差异<0.05秒).
- 据日志推导的Beam-on持续时间与计划的持续时间密切匹配,在三个月内具有很高的一致性.
- 离子室测量证实了门和非门模式之间的剂量测量一致,差异很小 (0.05 cGy ± 0.09 cGy).
结论:
- 拟议的基于日志文件的质量保证方法准确且可重复地评估呼吸门的性能.
- 这种方法提供了一种有效和客观的手段来标准化呼吸道辐射疗法的质量保证.
- 实施这种质量保证方法可以提高现代放射性瘤实践中的治疗准确性和患者安全性.
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