放射治疗中的圆束CT (CBCT):在国际环境中使用实用设置评估剂量
Mario Djukelic1, Colin John Martin2, Abdullah Abuhaimed3
1Department of Medical Technology and Physics, Sir Charles Gairdner Hospital, Nedlands WA 6009, Australia; Mentorship programme, International Commission on Radiological Protection, 280 Slater Street, Ottawa, Ontario K1P 5S9, Canada.
概括
放射治疗中心现在可以使用可访问的材料测量形光束CT (CBCT) 辐射剂量. 这可以通过优化成像协议,为癌症患者提供更好的辐射保护.
科学领域:
- 医学物理 医学物理
- 辐射疗法 辐射疗法
- 诊断成像 诊断成像 诊断成像
背景情况:
- 在线加速器 (linacs) 上的千伏圆束计算断层扫描 (kV CBCT) 对于验证放射治疗中的患者定位至关重要.
- 在kV CBCT协议中优化辐射保护对于最大限度地减少治疗目标周围健康组织的辐射暴露至关重要.
研究的目的:
- 开发和验证一种可访问的方法,用于测量kV CBCT成像中的辐射剂量指数.
- 为了使剂量测量和优化在全球辐射治疗中心的广泛采用.
主要方法:
- 在一项全球调查中,评估了ICRP受训人员的剂量测量设备的可用性.
- 使用参考和替代剂量计设置进行了圆束剂量指数 (CBDI) 的标准化测量.
- 测量结果与蒙特卡洛模拟进行了比较,以获得校正因数.
主要成果:
- 观察到标准剂量计设备 (100毫米室和CT幻影) 的有限可用性.
- 为替代设置 (农夫室和板块幽灵) 推导了校正因数,显示一致性在蒙特卡洛模拟的2%以内.
- 板块幻影和农民室设置被证明是有效的量化CBDI.
结论:
- 在大多数放射治疗中心,使用板幻体和Farmer室的可访问的替代方法允许准确的CBCT剂量量定量.
- 对于Varian Truebeam linacs,提供了校正因数,即使没有传统设备,也可以更轻松地测量剂量.
- 这种方法使全世界的放射治疗中心能够进行必要的成像剂量测量并实施优化策略.
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