医用直线加速器光子束特性的蒙特卡罗模拟。
Monte Carlo simulation of the photon beam characteristics from medical linear accelerators.
作者信息
Kim H K, Han S J, Kim J L, Kim B H, Chang S Y, Lee J K
机构信息
National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences, Seoul, 139-706, Korea.
出版信息
Radiat Prot Dosimetry. 2006;119(1-4):510-3. doi: 10.1093/rpd/nci636. Epub 2006 Apr 27.
The MCNPX code has been employed on a personal computer to calculate the dosimetric characteristics of the photon beams from the 6 MV Siemens MX2 and the 10 MV Varian Clinac 2100C linear accelerators. A model of the treatment head includes the major geometric structure within the beam path. The model was used to calculate the energy spectra of the photon beam, percentage depth dose and the dose profiles. The accuracy of the calculated results is examined by comparing them with the measured dose distributions for the two machines. The computed and measured depth dose curves agree to within 2% for all the depths beyond the build-up region for both treatment machines. The calculations agree to within 2% of the measured profiles within the 100-50% dose level. It has been found that the MCNPX code is an effective tool for simulating the clinical photon beam.
已在个人计算机上使用MCNPX代码来计算来自6兆伏西门子MX2和10兆伏瓦里安Clinac 2100C直线加速器的光子束的剂量学特征。治疗头模型包括射线路径内的主要几何结构。该模型用于计算光子束的能谱、百分深度剂量和剂量分布。通过将计算结果与两台机器的测量剂量分布进行比较来检验计算结果的准确性。对于两台治疗机器，在建成区之外的所有深度处，计算得到的和测量得到的深度剂量曲线在2%以内相符。在100 - 50%剂量水平内，计算结果与测量分布在2%以内相符。已发现MCNPX代码是模拟临床光子束的有效工具。
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