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首页> 外文期刊>Physics in medicine and biology. >Recording accelerator monitor units during electronic portal imaging: application to collimator position verification during IMRT.
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Recording accelerator monitor units during electronic portal imaging: application to collimator position verification during IMRT.

机译：在电子门禁成像期间记录加速器监控器单元：在IMRT期间应用于准直器位置验证。

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摘要

The application of multiple portal image acquisition to collimator position verification during dynamic multileaf collimation (DMLC) using a commercial camera-based electronic portal imaging device (EPID) (Theraview, Cablon Medical BV, Leusden, The Netherlands) mounted on an Elekta SL15i accelerator (Elekta Oncology Systems, Crawley, UK) is described. This is achieved using a custom-built dose acquisition system optically interfaced to both the camera control unit of the EPID and the monitor unit (MU) channel of the accelerator. The method uses the beam blanking camera control signal to trigger the dose acquisition system to read the cumulative accelerator MUs at the beginning and end of each period of image formation. A maximum delay of 15 ms has been estimated for recording of accelerator MUs in the current system. The camera interface was observed to have no effect on the operation of the EPID during normal clinical use and could therefore be left permanently in situ. Use of the system for collimator position verification of a test case is presented. The technique described uses a specific camera-based EPID and accelerator, although the general principle of using an EPID control signal to trigger recording of accelerator MUs may be applicable to other EPIDs/accelerators with suitable knowledge of the accelerator dosimetry system.
机译：使用安装在Elekta SL15i加速器上的商用基于摄像头的电子门户成像设备（EPID）（Theraview，Cablon Medical BV，Leusden，The Netherlands）在动态多叶准直（DMLC）期间将多门户图像采集应用于准直器位置验证描述了Elekta Oncology Systems，Crawley，UK。这是通过使用定制的剂量获取系统来实现的，该系统通过光学方式连接到EPID的摄像机控制单元和加速器的监控器（MU）通道。该方法使用光束消隐相机控制信号来触发剂量获取系统，以在图像形成的每个周期的开始和结束时读取累积的加速器MU。对于当前系统中的加速器MU记录，估计最大延迟为15 ms。观察到相机接口在正常临床使用期间对EPID的操作没有影响，因此可以永久留在原地。介绍了该系统在测试用例的准直仪位置验证中的使用。所描述的技术使用特定的基于相机的EPID和加速器，尽管使用EPID控制信号触发记录加速器MU的一般原理可能适用于其他具有加速器剂量测定系统知识的EPID /加速器。

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