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首页> 美国卫生研究院文献>Journal of Applied Clinical Medical Physics >Dosimetric properties of a beam quality‐matched 6 MV unflattened photon beam
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Dosimetric properties of a beam quality‐matched 6 MV unflattened photon beam

机译：光束质量匹配的6 MV非展平光子束的剂量学特性

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The purpose of this study was to report the characteristics of an equivalent quality unflattened (eqUF) photon beam in clinical implementation and to provide a generalized method to describe unflattened (UF) photon beam profiles. An unflattened photon beam with a beam quality equivalent to the corresponding flat 6 MV photon beam (WF) was obtained by removing the flattening filter from a Siemens ONCOR Avant‐Garde linear accelerator and adjusting the photon energy. A method independent from the WF beam profile was presented to describe UF beam profiles and other selected beam characteristics were examined. The short‐term beam stability was examined by dynamic beam profiles, recorded every 0.072 s in static and gated delivery, and the long‐term stability was evidenced by the five‐year clinical quality assurance records. The dose rate was raised fivefold using the eqUF beam. The depth of maximum dose (dmax) shifted 3 mm deeper, but the percent depth dose beyond dmax was very similar to that of the WF beam. The surface dose and out‐of‐field dose were lower, but the penumbra was slightly wider. The variation in head scatter and phantom scatter with changes in field size was smaller; the variation in the profile shape with change in depth was also smaller. The eqUF beam is stable 0.072 s after the beam is turned on, and the five‐year beam stability was comparable to that of the WF beam. A fivefold dose rate increase was observed in the eqUF beam with similar beam characteristics to other reported UF beam data except for a deeper dmax and a slightly wider penumbra. The initial and long‐term stability of the eqUF beam profile is on parity with the WF beam. The UF beam profile can be described in the generalized method independently without relying on the WF beam profile.PACS number: 87.55.de
机译：这项研究的目的是报告临床实施中等效质量的非展平（eqUF）光子束的特性，并提供一种描述非展平（UF）光子束轮廓的通用方法。通过从Siemens ONCOR Avant-Garde线性加速器上移除平坦滤波器并调整光子能量，可以获得光束质量与相应的6 MV平坦平坦光束（WF）相当的未平坦光子束。提出了一种独立于WF光束轮廓的方法来描述UF光束轮廓，并检查了其他选定的光束特性。通过动态光束轮廓检查短期光束稳定性，每隔0.072 s记录一次静态和门控传送，并通过五年临床质量保证记录来证明长期稳定性。使用eqUF光束将剂量率提高了五倍。最大剂量的深度（ d max ）深了3毫米，但深度百分比超出 d max 与WF梁非常相似。表面剂量和场外剂量较低，但半影稍宽。头部散射和幻影散射随场大小的变化较小；轮廓形状随深度的变化也较小。 eqUF光束在打开后0.072 s稳定，并且五年光束稳定性与WF光束相当。在eqUF光束中观察到剂量率增加了五倍，其光束特性与其他已报道的UF光束数据相似，只是 d max 和稍宽的半影。 eqUF光束轮廓的初始和长期稳定性与WF光束相当。 UF光束轮廓可以在不依赖WF光束轮廓的情况下以广义方法独立描述.PACS编号：87.55.de

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