Stereotactic radiosurgery (SRS) can be delivered with a standard linear accelerator (linac). At institutions having more than one linac, beam matching is common practice. In the literature, there are indications that machine central axis (CAX) matching for broad fields does not guarantee matching of small fields with side ≤2 cm. There is no indication on how matching for broad fields on axis translates to matching small fields off axis. These are of interest to multitarget single‐isocenter (MTSI) SRS planning and the present work addresses that gap in the literature.

中文翻译：

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用于立体定向放射外科的光束匹配直线加速器中小视场剂量测定（轴上和离轴）的一致性

立体定向放射外科 (SRS) 可以使用标准直线加速器 (linac) 进行。在拥有多个直线加速器的机构中，光束匹配是常见的做法。文献表明，宽视场的机器中心轴（CAX）匹配并不能保证边长≤2 cm的小视场的匹配。没有说明轴上宽视场的匹配如何转换为轴外小视场的匹配。这些对于多目标单等中心 (MTSI) SRS 规划很重要，目前的工作解决了文献中的这一空白。