A high-speed scintillation-based electronic portal imaging device

来源：百度知道 编辑：UC知道 时间：2024/06/06 17:29:59
In the step and shoot delivery, the leaves were supposed to
be static while the beam was on. However, in previous
work,7 we have observed that the log files indicate leaf motion
during beam-on time, often at the end of a segment. We
compared the log files and EPID data to the MLC instruction
files for field segment shapes. The field shapes from the three
sets agreed well, however 20 out of 62 segments present in
the instruction file were dropped missing in the log files
and EPID measurements. The log files showed leaf motions
at the end of 33 of the 42 segments with increased fluence.
This would seem to indicate leaf motion with beam on. However,
the EPID measurements showed leaf motions in only 7
of the 42 segments. The 7 observed leaf motions ranged
between 0.5 and 2.5 mm. The EPID data were more reliable
due to the fact that the camera was gated to the PFN of the
linear accelerator and time resolved every s

在这个步骤和射击交货,树叶排风扇
是静态而梁。然而,在先前的
7我们有工作日志文件显示的叶片运动
期间,经常是以beam-on结束的一个部分。我们
比较了日志文件和EPID数据到MLC指令
对现场段的形状。文件,从这三个领域形状
好,不过20套同意从62部分中
教学档案是下降的日志文件中失踪
与EPID测量。叶片运动的日志文件显示
在最后的33段与影响。42
这似乎表明叶片运动与梁。然而,
这个EPID测量表明叶片运动中只有7个
42片段。7观察叶片运动范围
0.5和2.5毫米之间。这个EPID数据更可靠
由于相机被封闭到PFN的
直线加速器和时间解决每一个的
辐射。图6个比较来自指令文件,
日志文件,和高速EPID结束部分