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评价国际原子能机构技术报告系列-483 检测器特定输出纠正因子对各种聚合器系统的评估

Mageshraja Kannan¹, Sathiyan Saminathan¹, Varatharaj Chandraraj¹

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

Journal of medical physics

|November 16, 2023

概括

精确的小场输出因子 (OF) 对于放射治疗至关重要. 使用检测器特定输出校正因子 (OCF) 显著减少了OF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
辐射瘤学辐射瘤学
剂量测量方法剂量测量方法

背景情况:

精确的输出因子 (OF) 对于现代放射治疗中使用的小型辐射场至关重要.
平过器 (FF) 和无FF光子束 (FFF) 为OF确定带来了独特的挑战.
治疗计划系统 (TPS) 的计算需要精确的输入数据来可靠地预测剂量.

研究的目的:

测量和比较小场输出因子 (OF) 使用各种探测器和对照器6MVFF和FFF光子束.
为了评估TPS计算的OFs与测量值的准确性.
评估检测器特定输出校正因子 (OCF) 对 OF 不确定性的影响.

主要方法:

使用十个探测器 (电离室和二极管) 测量了输出因子 (OF),并配备了四种不同的聚合器 (MLC和立体离子圆).
测量深度为10厘米,源至表面距离为90厘米.
用检测器特定输出校正系数 (OCF) 计算了校正的 OF,并与使用 TPS 计算的 OF 相比较.

主要成果:

检测器特定的OCF在小领域 (1厘米x1厘米S_clin) 中将OF的不确定性降低至4.1%.
经校正的测量OF和TPS计算的OF之间的最大变化在各种协同测量仪中在3.75%以内.
在IBA CC01室中显示的变化为3.75% (圆),3.72% (Apex mMLC),1.16% (敏捷性MLC) 和0.90% (千年MLC).

结论:

对于精确的OF测定,建议采用检测器特定的OCF,与技术报告系列-483.3保持一致.
在TPS调试期间实施OCF可以将任何探测器的小场OF变化减少到不到3%.
这提高了在小辐射场中剂量计算的可靠性,提高了治疗的准确性.

关键词:

输出因子的输出因子是指输出因子.小场剂量测量小场剂量测量刻板印象性的形形形形形形.技术报告系列 - - 483 治疗计划系统治疗计划系统

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