对于0.35 T MR-linac投入使用的MR兼容探测器的评估
Michel Chea1, Mathilde Croisé2, Christelle Huet3
1Medical Physics Department, Pitié-Salpêtrière Hospital, AP-HP Sorbonne University, 47-83 Boulevard de l'Hôpital, 75651, Paris Cedex 13, France. michel.chea@aphp.fr.
Radiation oncology (London, England)
|March 21, 2024
概括
这项研究验证了MR-linac调试的MR兼容探测器,发现PTW 31010电离室适用于绝对剂量测量,PTW 60019微钻适用于相对测量,在低磁场时磁场效应最小化.
科学领域:
- 医学物理 医学物理
- 辐射瘤学 辐射瘤学
- 磁共振成像是一种磁共振成像技术.
背景情况:
- 启动磁共振线性加速器 (MR-linacs) 需要精确的探测器测量.
- 蒙特卡洛 (MC) 模拟对于在MR-linac治疗计划系统 (TPS) 中建立参考剂量计算至关重要.
研究的目的:
- 通过对MC TPS计算进行统计比较,评估针对MR-linac调试的MR兼容探测器的综合选择.
- 为了验证MR-linac应用的调试试验和二次MC剂量计算.
主要方法:
- 使用Viewray TPS生成的MC参考数据,用于绝对剂量,百分比深度剂量 (PDD),配置文件和输出因子.
- 将MC数据与十种不同的探测器的测量进行了比较,包括电离室,二极管,薄膜和微立方体.
- 执行了三个调试步骤:光束模型验证,幻影输出校准验证,以及IAEA-TECDOC-1583推的测试.
主要成果:
- 高分辨率探测器显示与TPS数据的对称度一致>1%.
- 角响应有所不同,PTW 60023和SN Edge与60°的PTW 31010相比显示出显著的偏差.
- 输出因子 (OF) 的偏差为 -1.7±1.6%的未经纠正的和 -4.0±0.6%的纠正的OF在小领域,相对于 -4.8±0.8%的被动剂量计.
- 对于测试的电离室,幻体中绝对剂量对TPS的平均偏差在±1.2%以内.
结论:
- 在低磁场强度下,磁场对探测器测量的影响是最小的.
- 在MR-linac调试和QA期间,PTW 31010电离室可靠地进行绝对剂量验证.
- 对于相对剂量测量,PTW 60019微钻显示出跨场大小的最佳一致性;对于对称性评估,电离室是最佳的.
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