The behavior of several microionization chambers in small intensity modulated radiotherapy fields
The behavior of several microionization chambers in small intensity modulated radiotherapy fields
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DOI：
10.1118/1.1788911
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发表时间：
2004-10-01
期刊：
影响因子：
3.8
通讯作者：
Scielzo, G
中科院分区：
文献类型：
--
作者：
Stasi, M;Baiotto, B;Scielzo, G
这项工作的目的是比较可用于调强放射治疗中小射野剂量测量的不同电离室。必须评估与这些小辐射场相关的一些剂量测定方面，即缺乏电子横向平衡和陡峭的剂量区域，以获得准确的技术实施。此外，与梁或段的映射相比，需要考虑腔室敏感体积的大小。如果腔室的尺寸对于场的平坦度来说太大，则测量可能会偏离某一点的预期吸收剂量。我们建议将不同微电离室之间的各种剂量测定值与较小的剂量计（例如金刚石探测器）进行比较。 (C) 2004 年美国医学物理学家协会。
The aim of this work is to compare different ion chambers available for dose measurements in small fields used in intensity modulated radiotherapy. Some dosimetric aspects, related, to these small radiation fields, i.e., lack of electronic lateral equilibrium and steep dose region, must be evaluated, in order to obtain an accurate technique implementation. Furthermore, the size of the sensitive volume of the chambers compared with the mapping of the beams or segments needs consideration. If the size of the chamber is too large for the flatness of the field, the measurement can deviate from the expected absorbed dose at a point. We propose a comparison of various dosimetric values between different microionization chambers with respect to a smaller dosimeter, such as the diamond detector. (C) 2004 American Association of Physicists in Medicine.