CAJ | 학술논문

目的研究电子束能谱和角分布对其放疗剂量分布影响.方法应用模拟得到的医用直线加速器电子束能谱分布和角分布作为输入文件,使用经修改的PENELOPE程序中蒙特卡罗方法模拟计算电子束能谱宽度和角分布对射野中心轴剂量分布和离轴剂量分布.结果电子束能谱宽度和角分布对射野中心轴剂量分布和离轴剂量分布无明显影响,剂量分布曲线几乎重合；只有在能谱展宽为2.5 MeV时才有明显影响,剂量分布曲线有显著差别.结论根据本研究蒙特卡罗模拟计算结果设计治疗计划系统电子线算法时可不考虑能谱宽度和角分布影响,而直接使用电子线最可几能量计算,这样可节省大约9％时间而有助于提高计算速度.
목적 연구전자속능보화각분포대기방료제량분포영향.방법 응용모의득도적의용직선가속기전자속능보분포화각분포작위수입문건,사용경수개적PENELOPE정서중몽특잡라방법모의계산전자속능보관도화각분포대사야중심축제량분포화리축제량분포.결과 전자속능보관도화각분포대사야중심축제량분포화리축제량분포무명현영향,제량분포곡선궤호중합；지유재능보전관위2.5 MeV시재유명현영향,제량분포곡선유현저차별.결론 근거본연구몽특잡라모의계산결과설계치료계화계통전자선산법시가불고필능보관도화각분포영향,이직접사용전자선최가궤능량계산,저양가절성대약9％시간이유조우제고계산속도.
Objective To study of the impact on dose distribution by electron width of energy spectrum and angular distribution using Monte Carlo simulation.Methods The simulated electron energy spectrum and angular distributions was as the input parameters and percentage depth dose (PDD) and offaxis curves were simulated by a modified PENELOPE code package. Results PDD and off-axis dose distribution curves are almost the same and are not sensitive to energy spectrum width and angular distribution with the exception of energy spectrum width of 2.5 MeV with obviously different curves.Conclusions In the situation of clinical treatment,spectrum and angular distributions can be ignored when their width are not very large.It is helpful to save about 9％ time by using monoenergy beams in treatment planning system development.