首页> 美国卫生研究院文献>Journal of Applied Clinical Medical Physics >Radiation transmission leakage and beam penumbra measurements of a micro‐multileaf collimator using GafChromic EBT film
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Radiation transmission leakage and beam penumbra measurements of a micro‐multileaf collimator using GafChromic EBT film

机译:使用GafChromic EBT膜的微多叶准直仪的辐射透射泄漏和光束半影测量

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摘要

Micro‐multileaf collimator systems coupled to linear accelerators for radioneurosurgery treatments require a rigorous dosimetric characterization in order to be used in 3D conformal and intensity modulated stereotactic radiosurgery and radiotherapy applications. This characterization involves high precision measurements of leaf transmission, leakage and beam penumbra through the collimation system and requires the use of detectors with high spatial resolution, high sensitivity and practically no energy dependence. In this work the use of GafChromic EBT radiochromic film to measure the basic dosimetric properties of the m3‐mMLC (BrainLAB, Germany) micro‐multileaf collimator system integrated to a 6 MV linear accelerator, is reported. Results show that average values of transmission and leakage radiation are 0.93 ± 0.05% and 1.08 ± 0.08%, respectively. The 80–20% beam penumbra were found to be 2.26 ± 0.11 mm along the leaf side (perpendicular to leaf motion) and 2.31 ± 0.11 mm along the leaf end (parallel to leaf motion) using square field sizes ranging from 9.1 to 1.8 cm. These measurements are in agreement with values reported in the literature for the same type of mMLC using different radiation detectors.PACS number: 87.56.N‐
机译:微多叶准直仪系统与用于放射神经外科治疗的线性加速器耦合需要严格的剂量学表征,才能用于3D保形和强度调制立体定向放射外科及放射治疗应用。这种表征涉及通过准直系统对叶片透射,泄漏和光束半影进行高精度测量,并且需要使用具有高空间分辨率,高灵敏度并且几乎没有能量依赖性的探测器。在这项工作中,报道了使用GafChromic EBT放射致变色膜来测量集成到6 MV线性加速器的m3-mMLC(德国BrainLAB)微多叶准直仪系统的基本剂量特性。结果表明,透射和泄漏辐射的平均值分别为0.93±0.05%和1.08±0.08%。在9.1至1.8厘米的正方形视场范围内,发现80-20%的光束半影沿叶侧为2.26±0.11 mm(垂直于叶运动),沿叶端为2.31±0.11 mm(平行于叶运动) 。这些测量值与文献报道的使用不同辐射探测器的相同类型mMLC的值一致.PACS编号:87.56.N

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