使用Agility机头的医科达直线加速器的束流焦点位置确定；附有可行程序的实用指南。
Beam focal spot position determination for an Elekta linac with the Agility head; practical guide with a ready-to-go procedure.
作者信息
Chojnowski Jacek M, Taylor Lee M, Sykes Jonathan R, Thwaites David I
机构信息
Mid North Coast Cancer Institute, Coffs Harbour Health Campus, Coffs Harbour, NSW, Australia.
Institute of Medical Physics, School of Physics, University of Sydney, Sydney, NSW, Australia.
出版信息
J Appl Clin Med Phys. 2018 Jul;19(4):44-47. doi: 10.1002/acm2.12344. Epub 2018 May 14.
A novel phantomless, EPID-based method of measuring the beam focal spot offset of a linear accelerator was proposed and validated for Varian machines. In this method, one set of jaws and the MLC were utilized to form a symmetric field and then a 180 collimator rotation was utilized to determine the radiation isocenter defined by the jaws and the MLC, respectively. The difference between these two isocentres is directly correlated with the beam focal spot offset of the linear accelerator. In the current work, the method has been considered for Elekta linacs. An Elekta linac with the Agility head does not have two set of jaws, therefore, a modified method is presented making use of one set of diaphragms, the MLC and a full 360 collimator rotation. The modified method has been tested on two Elekta Synergy linacs with Agility heads and independently validated. A practical guide with instructions and a MATLAB code is attached for easy implementation.
提出了一种基于电子射野影像装置（EPID）的新型无体模方法，用于测量直线加速器的束流焦点偏移，并在瓦里安直线加速器上得到验证。在该方法中，利用一组准直器和多叶准直器（MLC）形成对称野，然后通过180°准直器旋转分别确定由准直器和MLC定义的辐射等中心。这两个等中心之间的差异与直线加速器的束流焦点偏移直接相关。在当前工作中，该方法已应用于医科达直线加速器。配备Agility机头的医科达直线加速器没有两组准直器，因此，提出了一种改进方法，利用一组光阑、MLC和360°准直器全旋转。该改进方法已在两台配备Agility机头的医科达Synergy直线加速器上进行测试，并得到独立验证。还附上了一份带有说明的实用指南和一个MATLAB代码，以便于实施。
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