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首页> 外文期刊>Physics in medicine and biology. >Measurement for the MLC leaf velocity profile by considering the leaf leakage using a radiographic film
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Measurement for the MLC leaf velocity profile by considering the leaf leakage using a radiographic film

机译：通过使用射线照相胶片考虑叶片泄漏来测量MLC叶片速度分布

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摘要

A method to measure the velocity profile of a multi-leaf collimator (MLC) leaf along its travel range using a radiographic film is reported by considering the intra-leaf leakage. A specific dynamic MLC field with leaves travelling from the field edge to the isocentre line was designed. The field was used to expose a radiographic film, which was then scanned, and the dose profile along the horizontal leaf axis was measured. The velocity at a sampling point on the film can be calculated by considering the horizontal distance between the sampling point and the isocentre line, dose at the sampling point, dose rate of the linear accelerator, the total leaf travel time from the field edge to isocentre line and the pre-measured dose rate of leaf leakage. With the leaf velocities and velocity profiles for all MLC leaves measured routinely, a comprehensive and simple QA for the MLC can be set up to test the consistency of the leaf velocity performance which is essential to the IMRT delivery using a sliding window technique.
机译：通过考虑片内泄漏，报道了一种使用放射线摄影胶片测量多叶准直器（MLC）叶片沿其行进范围的速度分布的方法。设计了一个特定的动态MLC场，其叶子从场边缘移动到等中心线。该场用于曝光射线照相胶片，然后对其进行扫描，并测量沿水平叶轴的剂量分布。可以通过考虑采样点和等中心线之间的水平距离，采样点处的剂量，线性加速器的剂量率，从视场边缘到等中心点的总叶片移动时间来计算薄膜上采样点的速度线和预先测得的叶漏剂量率。通过常规测量所有MLC叶片的叶片速度和速度曲线，可以为MLC设置全面而简单的QA，以测试叶片速度性能的一致性，这对于使用滑动窗口技术进行IMRT传递至关重要。

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