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首页> 外文期刊>Journal of King Saud University >Analysis of stabilization of photon beam softening with off-axis distance for filtration system enhancement to increase dosimetry in radiotherapy
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Analysis of stabilization of photon beam softening with off-axis distance for filtration system enhancement to increase dosimetry in radiotherapy

机译：离轴距离的光子束软化稳定性分析，用于增强过滤系统以增加放射治疗的剂量

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Beam softening is depending on the material atomic number and photon beam energy for photon beam filtration; the filtration quality is essential to producing a clinical beam in external radiotherapy. Beam softening analysis is done using Monte Carlo method. The Monte Carlo model was performed for 6?MV photon beam produced by Varian Clinac 2100 with flattening filter thereafter the flattening filter was removed and replaced by slab of aluminum and copper with different thickness. The purpose of this study is to analyze the photon beam softening with off-axis distance for the reference field size of 10?×?10?cm2; the beam softening is studied in terms of tow coefficients a1and a2.Inside the irradiation field, for aluminum slab, the coefficient a1varied in interval from ?1.2?cm?1to 1.7?cm?1and it has big fluctuations with off-axis distance. For copper, a1varied from 0?cm?1to 1.5?cm?1and it has small fluctuations with off-axis distance. The coefficient a2, for aluminum slab, varied from ?1 cm?2to 0.4?cm?2with big fluctuations. For copper slab, a2varied from ?0.9?cm?2to 0?cm?2with small fluctuations. We conclude that the beam softening is very stabilized for copper than aluminum in despite of copper attenuate more photons than aluminum for same slab thickness when they are used in photon beam filtration. To increase dosimetry in radiotherapy, the flattening filter should be constructed based on low atomic number materials but with high stabilization of beam softening with off-axis distance.
机译：束的软化取决于材料原子序数和用于光子束过滤的光子束能量;过滤质量对于在外部放射治疗中产生临床光束至关重要。束软化分析使用蒙特卡洛方法进行。对由瓦里安·克林纳克（Varian Clinac）2100产生的带有平整滤光片的6？MV光子束进行蒙特卡洛模型，此后去除平整滤光片，并用厚度不同的铝和铜板代替。本研究的目的是分析离轴距离为10？×？10？cm2的参考场大小的光子束软化。在束的辐照场内，铝板的系数a1在？1.2？cm？1到1.7？cm？1的范围内变化，并且随着离轴距离的变化较大。对于铜，a1在0？cm？1至1.5？cm？1之间变化，并且随着离轴距离的变化很小。对于铝板，系数a2在11 cm？2到0.4？cm？2之间变化较大。对于铜板，a2在？0.9？cm？2到0？cm？2之间变化，波动很小。我们得出结论，尽管铜用于光子束过滤时，尽管铜在相同的平板厚度下比铝衰减更多的光子，但铜的束软化比铝非常稳定。为了增加放射治疗中的剂量，平整滤光片应基于低原子序数的材料制成，但光束软化的离轴距离高度稳定。

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