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首页> 美国卫生研究院文献>Journal of Applied Clinical Medical Physics >Analytical approach for determining beam profiles in water phantom of symmetric and asymmetric fields of wedged blocked and open photon beams
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Analytical approach for determining beam profiles in water phantom of symmetric and asymmetric fields of wedged blocked and open photon beams

机译：确定楔形受阻和开放光子束的对称场和非对称场的水模中光束轮廓的分析方法

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Nowadays, in most radiotherapy departments, the commercial treatment planning systems (TPS) used to calculate dose distributions needs to be verified; therefore, quick, easy‐to‐use, and low‐cost dose distribution algorithms are desirable to test and verify the performance of the TPS. In this paper, we put forth an analytical method to calculate the phantom scatter contribution and depth dose on the central axis based on the equivalent square concept. Then, this method was generalized to calculate the profiles at any depth and for several field shapes — regular or irregular fields—under symmetry and asymmetry photon beam conditions. Varian 2100 C/D and Siemens Primus Plus linacs with 6 and 18 MV photon beam were used for irradiations. Percentage depth doses (PDDs) were measured for a large number of square fields for both energies and for 45° wedge, which were employed to obtain the profiles in any depth. To assess the accuracy of the calculated profiles, several profile measurements were carried out for some treatment fields. The calculated and measured profiles were compared by gamma‐index calculation. All γ–index calculations were based on a 3% dose criterion and a 3 mm dose‐to‐agreement (DTA) acceptance criterion. The γ values were less than 1 at most points. However, the maximum γ observed was about 1.10 in the penumbra region in most fields and in the central area for the asymmetric fields. This analytical approach provides a generally quick and fairly accurate algorithm to calculate dose distribution for some treatment fields in conventional radiotherapy.PACS number: 87.10.Ca
机译：如今，在大多数放射治疗部门中，需要对用于计算剂量分布的商业治疗计划系统（TPS）进行验证；因此，需要一种快速，易于使用和低成本的剂量分配算法来测试和验证TPS的性能。在本文中，我们提出了一种基于等效平方概念的计算方法，以计算中心点上的幻像散射贡献和深度剂量。然后，将这种方法推广到在对称和不对称光子束条件下，计算任意深度和几种场形状（规则或不规则场）的剖面。使用具有6和18 MV光子束的Varian 2100 C / D和Siemens Primus Plus直线加速器进行辐照。针对能量和45°楔形的大量方场测量了百分比深度剂量（PDD），将其用于获取任何深度的轮廓。为了评估所计算轮廓的准确性，对某些处理场进行了几次轮廓测量。通过伽马指数计算比较了计算和测量的轮廓。所有的γ指数计算均基于3％剂量标准和3 mm剂量协议（DTA）接受标准。多数时候，γ值小于1。但是，在大多数场的半影区域和非对称场的中心区域观察到的最大γ约为1.10。这种分析方法提供了一种通常快速且相当准确的算法来计算常规放射治疗中某些治疗领域的剂量分布.PACS编号：87.10.Ca

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