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参考类离子室的辐射前剂量要求:量化测量稳定性

Takumi Yamada¹, Kazuki Mayumi¹, Satoshi Tanabe²

¹Section of Radiology, Department of Medical Technology, Niigata University Medical and Dental Hospital, Niigata, Japan.

Journal of applied clinical medical physics

|September 30, 2025

概括

电离室的预辐射并不总是必要的. 中体积室需要高达21.25 Gy的稳定读数,而大体积室则需要立即稳定,以获得准确的剂量测量.

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:

电离室的预辐射是标准实践,以确保辐射治疗中稳定的输出读数.
然而,在受控条件下的不同室型号的特定预辐射要求尚未明确定义.

研究的目的:

量化评估各种参考类电离室中稳定输出所需的辐射前剂量.
在评估过程中,尽量减少环境和系统因素带来的不确定性.

主要方法:

在严格的环境控制下测试了12个参考电离室 (25°C房间/水,50%RH).
使用10MV光子束测量输出稳定性,将其规范化为监控室.
稳定性标准:<0.1%变化没有趋势. 确定了每个室内的最佳辐射前剂量.

主要成果:

大容量室 (Exradin A12,IBA FC65G,PTW 30013) 显示与第一次照射相比<0.05%的变化,这表明不需要进行预照射.
中体积室 (Exradin A1SL,IBA CC13,PTW 31021) 变化高达0.25%,需要约21.25 Gy (100 MU x 25) 才能保持稳定.

结论:

电离室所需的辐射前剂量取决于电离室.
观察到的输出变化明显低于先前报告的1%,表明了简化临床参考剂量计的潜力.

关键词:

室内类型的依赖性室内类型的依赖性电离室稳定性电离室稳定性输出可重复性输出可重复性在照射前进行照射.参考剂量测量方法的参考剂量测量方法

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