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首页> 外文期刊>Journal of Medical Physics/Association of Medical Physicists of India >Comparison of Head Scatter Factor for 6MV and 10MV flattened (FB) and Unflattened (FFF) Photon Beam using indigenously Designed Columnar Mini Phantom
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Comparison of Head Scatter Factor for 6MV and 10MV flattened (FB) and Unflattened (FFF) Photon Beam using indigenously Designed Columnar Mini Phantom

机译：使用本地设计的柱状微型幻像比较6MV和10MV展平（FB）和未展平（FFF）光子束的头部散射因子

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摘要

To measure and compare the head scatter factor for flattened (FB) and unflattened (FFF) of 6MV and 10MV photon beam using indigenously designed mini phantom. A columnar mini phantom was designed as recommended by AAPM Task Group 74 with low and high atomic number materials at 10 cm (mini phantom) and at approximately twice the depth of maximum dose water equivalent thickness (brass build-up cap). Scatter in the accelerator (Sc) values of 6MV-FFF photon beams are lesser than that of the 6MV-FB photon beams (0.66-2.8%; Clinac iX, 2300CD) and (0.47-1.74%; True beam) for field sizes ranging from 10 × 10 cm2 to 40 × 40 cm2. Sc values of 10MV-FFF photon beams are lesser (0.61-2.19%; True beam) than that of the 10MV-FB photons beams for field sizes ranging from 10 × 10 cm2 to 40 × 40 cm2. The SSD had no influence on head scatter for both flattened and unflattened beams and irrespective of head design of the different linear accelerators. The presence of field shaping device influences the Sc values. The collimator exchange effect reveals that the opening of the upper jaw increases Sc irrespective of FB or FFF photon beams and different linear accelerators, and it is less significant in FFF beams. Sc values of 6MV-FB square field were in good agreement with that of AAPM, TG-74 published data for Varian (Clinac iX, 2300CD) accelerator. Our results confirm that the removal of flattening filter decreases in the head scatter factor compared to flattened beam. This could reduce the out-of-field dose in advanced treatment delivery techniques.Keywords: Flattening filter, mini phantom, collimator scatter factor
机译：使用本地设计的微型幻像来测量和比较6MV和10MV光子束的展平（FB）和不展平（FFF）的头部散射系数。根据AAPM任务组74的建议，设计了一种圆柱状微型体模，其原子序数低且高的材料在10厘米处（微型体模），深度约为最大剂量水当量厚度的两倍（黄铜堆积帽）。对于视场大小范围，6MV-FFF光子束的加速器（Sc）值的散射小于6MV-FB光子束的（0.66-2.8％; Clinac iX，2300CD）和（0.47-1.74％; True束）从10×10 cm2到40×40 cm2。对于10×10 cm2到40×40 cm2的视场，10MV-FFF光子束的Sc值比10MV-FB光子束的Sc值小（0.61-2.19％;真实束）。对于平坦光束和未平坦光束，SSD都不会影响磁头散射，而与不同线性加速器的磁头设计无关。场整形设备的存在会影响Sc值。准直器交换效应表明，不管FB或FFF光子束和不同的线性加速器如何，上颌的张开都会增加Sc，而在FFF束中，上颌的张开不那么重要。 6MV-FB正方形场的Sc值与AAPM，TG-74发布的Varian（Clinac iX，2300CD）加速器的数据非常吻合。我们的结果证实，与平坦光束相比，移除平坦滤波器的头部散射系数降低。这可以减少先进治疗提供技术中的场外剂量。关键字：展平滤波器，微型幻像，准直器散射因子

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