日志文件源和数据频率对基于日志文件的患者特定质量保证准确性的影响
Akbar Azzi1, Gerd Heilemann2, Dietmar Georg2
1Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, 16424 Depok, Indonesia.
Zeitschrift fur medizinische Physik
|June 26, 2023
概括
基于日志文件的患者特定质量保证 (PSQA) 可以提高适应性放射治疗的效率. 这项研究发现,瘤信息系统 (OIS) 的日志数据需要提高质量,以获得足够的PSQA,建立3.3毫米根平均平方误差容忍度.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 辐射疗法质量保证 辐射疗法质量保证
背景情况:
- 患者特异性质量保证 (PSQA) 对于适应性放射治疗至关重要,但耗时.
- 基于日志文件的PSQA提供了提高效率的潜在解决方案.
- 将线性加速器 (Linac) 日志文件与瘤信息系统 (OIS) 日志数据进行比较对于验证这种方法至关重要.
研究的目的:
- 为了比较高频Linac日志文件与低频OIS日志数据的剂量计准确性,PSQA.
- 评估在各种处理站点和技术中使用OIS日志数据用于PSQA的可行性.
- 建立基于剂量计准确度的OIS日志数据质量的容忍限度.
主要方法:
- 使用马分析 (2%/2毫米) 评估剂量计准确性,比较Linac日志,OIS日志和原始治疗计划.
- 包括30名接受VMAT (头,大脑,前列腺) 治疗的患者和10名接受SBRT (3D-CRT) 治疗的患者.
- 分析了PTV和OAR的DVH参数 (D98%,D50%,D2%),以及叶子位置RMS错误.
主要成果:
- 在HN,大脑和前列腺病例中,针对特定PTV参数的日志类型和原始计划之间观察到显著的剂量测量差异.
- OIS日志叶位置RMS错误大约是Linac日志VMAT的两倍.
- 在OIS日志 (r = -0.71) 中发现了马传递率和RMS误差之间的强相关性.
结论:
- 对于基于OIS日志的PSQA,确定了3.3毫米RMS误差的容忍限.
- 虽然OIS日志数据可以用于PSQA,但其质量需要改进,以便可靠的适应性放射治疗.
- 建议进一步优化OIS数据采集,以确保足够的PSQA.
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