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使用各种探测器确定束匹配线性加速器的小场输出因子,并使用国际原子能机构技术报告系列483协议比较特定探测器输出校正因子

Mageshraja Kannan¹, Sathiyan Saminathan¹, Varatharaj Chandraraj¹

¹Department of Radiation Physics, Kidwai Memorial Institute of Oncology, Bengaluru, Karnataka, India.

Reports of practical oncology and radiotherapy : journal of Greatpoland Cancer Center in Poznan and Polish Society of Radiation Oncology

|July 17, 2023

概括

精确的小场输出因子 (OF) 对放射治疗至关重要. 这项研究发现,检测器特定输出校正因子 (OCF) 显著降低了小场测量的不确定性,提高了处理计划系统 (TPS) 的准确性.

科学领域:

医学物理医学物理
辐射疗法辐射疗法
辐射瘤学辐射瘤学

背景情况:

射线疗法中的光束匹配确保了线性加速器之间的剂量测量一致性.
在现代放射治疗技术中,小场输出因子 (OF) 对于精确的剂量计算至关重要.

研究的目的:

测量小场输出因子 (OF) 使用各种探测器在光束匹配的线性加速器上.
为了将测量的OF与处理计划系统 (TPS) 的蒙特卡洛计算进行比较.
评估检测器特定输出校正因子 (OCF) 对小场测量的影响.

主要方法:

测量是在四个光束匹配的Elekta线性加速器 (Versa HD和Infinity) 上进行的,光子能量为6 MV和10 MV,既有平平过器 (FF) 和无平平过器 (FFF).
十个不同的探测器 (四个电离室,六个二极管探测器) 用于在1x1cm2到10x10cm2的场面大小的OF测量.
输出因子被规范化为10x10cm2的场面大小,并确定了未经校正的和经过校正的OF,并与TPS蒙特卡洛计算进行了校正的OF比较.

主要成果:

对于所有能量和探测器来说,加速器之间的小场校正和未校正的OF变化在1%以内.
增加场面大小减少了探测器之间的OF差异,并减少了相对标准偏差 (RSD) 值.
基于TRS 483指南的检测器特定输出校正因子 (OCF) 的实施大大降低了测量不确定性.

结论:

在治疗计划系统 (TPS) 中,对小领域实施 OF 校正对于精确的放射治疗至关重要.
为了保持治疗准确性,需要仔细将纠正的小场OF数据集成到TPS中.

关键词:

线性加速器的线性加速器输出因子输出因子一个小小的田地.治疗规划系统的系统规划

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