6使用GEANT4虚拟钳口的Varian Clinac iX的MV光子束建模
6 MV photon beam modeling for Varian Clinac iX using GEANT4 virtual jaw
摘要：
大多数虚拟源模型（VSM）使用射束建模，但患者相关次级准直器（钳口）除外。与治疗头的其他组件不同，钳口吸收了许多由韧致辐射产生的光子，这降低了模拟的效率。为了提高VSM的计算效率，提出了一种基于虚拟钳口的梁建模方法。在均质水模体中计算的虚拟颌部VSM的百分深度剂量和轮廓与CC_（13）圆柱型离子室的测量结果在2%的误差范围内一致，80 ~ 20%的半影宽度与测量结果在0.6mm的误差范围内一致。使用虚拟颚的VSM的计算效率预期增加约67%。
英文摘要：
Most virtual source models (VSM) use beam modeling, with the exception of the patient-dependent secondary collimator (jaw). Unlike other components of the treatment head, the jaw absorbs many photons generated by the bremsstrahlung, which decreases the efficiency of the simulation. In the present study, a new method of beam modeling using a virtual jaw was applied to improve the calculation efficiency of VSM. The results for the percentage depth dose and profile of the virtual jaw VSM calculated in a homogeneous water phantom agreed with the measurement results for the CC13 cylinder type ion chamber within an error rate of 2%, and the 80 to 20% penumbra width agreed with the measurement results within an error of 0.6 mm. Compared with the existing VSM, in which a great number of photons are absorbed, the calculation efficiency of the VSM using the virtual jaw was expected to increase by approximately 67%.
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