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使用uRT-linac 506c的EPID系统进行预处理质量保证的可行性研究

QiaoYun Zhu¹, XiaoHui Yu², Qian Wang³

¹Department of Oncology, Shenzhen Hospital, Southern Medical University, Shenzhen, 518101, China; School of Biomedical Engineering, Southern Medical University, Guangzhou, 510515, China.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine

|August 26, 2025

概括

新型的 uRT-linac 506c

科学领域:

医学物理
辐射瘤学
质量保证

背景情况:

像强度调节辐射疗法 (IMRT) 和体积调节弧线疗法 (VMAT) 这样的先进放射疗法需要严格的治疗前质量保证 (PQA).
确保辐射输送的准确性对于预防事故和优化患者结果至关重要.
电子门户成像设备 (EPID) 系统为有效的PQA提供了潜在的途径.

研究的目的:

验证 uRT-linac 506c 的集成 EPID 系统作为替代 PQA 方法.
将EPID系统的性能与已建立的IMatriXX PQA系统进行比较.
评估PQA系统对治疗计划故意错误的敏感性.

主要方法:

分析了30种强度调节辐射疗法 (IMRT) 和30种体积调节弧线疗法 (VMAT) 方案.
使用玛指数 (GI) 标准来评估预测值和测量值之间的剂量分配一致性.
通过引入MLC位置,聚合器旋转和剂量递送的故意错误来测试IMatriXX和EPID系统的灵敏度.

主要成果:

根据3 mm/ 2%的马指数标准,EPID系统的平均通过率高于IMatriXX (99. 73% ± 0. 77%,98. 65% ± 1. 13%) 的IMRT,VMAT的平均通过率高于99. 91%.
这两种系统都表现出检测错误的能力,EPID系统对聚合器旋转错误的敏感度更高 (IMatriXX的2°与3°相比).
这两种验证系统准确地检测出剂量误差为2%.

结论:

uRT- linac 506c的EPID系统与IMatriXX治疗前质量保证系统有很强的相关性.
对于传统的IMatriXX PQA方法来说,EPID系统是一个有前途的,可能可比的替代方案.
建议对更大群体进行进一步的研究,以确认EPID系统的非劣势性.

关键词:

美国 IMRT 质量保证质量保证放射治疗机器人质量管理

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