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根据剂量面积产品测量,在小领域定义现场输出因子:可行性研究

Julien Jurczak^1,2, Benjamin Rapp¹, Jean-Marc Bordy¹

¹CEA, List, Laboratoire National Henri Becquerel (LNE-LNHB), Palaiseau, France.

Medical physics

|January 24, 2024

概括

在小领域将剂量面积产物在水中 (DAPw) 转换为点剂量是具有挑战性的. 发现了显著的偏差,这表明需要进一步研究像片这样的探测器来准确测量剂量.

科学领域:

医学物理医学物理
辐射剂量计辐射剂量计
小场辐射疗法小场辐射疗法

背景情况:

在水中的剂量面积产物 (DAPw) 用于小领域 (低至5毫米) 的初级标准,不确定性低.
目前的处理规划系统没有整合DAPw测量.
精确的剂量测量在小领域对于放射治疗的精度至关重要.

研究的目的:

评估在小领域将DAPw转换为点剂量的可行性.
为了确定DAPw测量的体积平均校正系数.
为了比较DAPw到点剂量方法与国际原子能机构TRS483实地输出因子的方法.

主要方法:

使用二极管,微钻和微电离室测量了根据国际原子能机构TRS483.3的测量结果.
在DAPw中校准的专用平面平行电离室被用于DAPw以点剂量方法.
测量了光束形状,以获得DAPw转换的体积平均化校正因数.

主要成果:

国际原子能机构TRS483现场输出因子在检测器之间显示出良好的一致性 (±3%).
对于小型田地,体积平均的校正因子表现出很大的变化 (高达26%).
对于小型场输出因子,两种方法之间观察到高达15%的偏差,与光束形状的不确定性有关.

结论:

虽然DAPw能够实现低不确定性的初级标准,但将其转换为点剂量需要准确的体积平均校正因子.
目前的点检测器对DAPw转换为点剂量产生了不满意的结果.
为了可靠地将DAP初级标准传递给用户,需要对像膜这样的探测器进行进一步的研究.

关键词:

产品的剂量区域产品的剂量区域.输出因子输出因子一个小小的田地.

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