CAJ | 학술논문

目的探讨蒙特卡罗N粒子运输法(MCNP)模拟计算的可行性.方法用百分深度剂量(PDD)分布及标准峰值散射因子(NPSP),比较水模体计算值和实际测量及报告值之间的差异.结果在10 cm×10 cm射野时,测量值和计算值之间差异无统计学意义(t=-0.41,P>0.05),而在5 cm×5 cm及12 cm×12 cm时,测量值与计算值之间差异有统计学意义(t=7.2、-4.6,P<0.05).计算值和报告值之间符合良好,差异无统计学意义(t=-1.906,P>0.05).同一射野最大剂量点下百分深度剂量随深度增大而减少,同一深度处百分深度剂量随射野增大而增大;同一深度处射野中心轴上的剂量最高,向射野边缘剂量逐渐减少.结论利用蒙特卡罗MCNP可以建立一组准确和全面的百分深度剂量及标准峰值散射因子参数,为放疗质量保证和质量控制提供依据.
목적 탐토몽특잡라N입자운수법(MCNP)모의계산적가행성.방법 용백분심도제량(PDD)분포급표준봉치산사인자(NPSP),비교수모체계산치화실제측량급보고치지간적차이.결과 재10 cm×10 cm사야시,측량치화계산치지간차이무통계학의의(t=-0.41,P>0.05),이재5 cm×5 cm급12 cm×12 cm시,측량치여계산치지간차이유통계학의의(t=7.2、-4.6,P<0.05).계산치화보고치지간부합량호,차이무통계학의의(t=-1.906,P>0.05).동일사야최대제량점하백분심도제량수심도증대이감소,동일심도처백분심도제량수사야증대이증대;동일심도처사야중심축상적제량최고,향사야변연제량축점감소.결론 이용몽특잡라MCNP가이건립일조준학화전면적백분심도제량급표준봉치산사인자삼수,위방료질량보증화질량공제제공의거.
Objective To discuss the feasibility of Monte Carlo N-particle transport code(MCNP)simulated calculation.Methods The calculation in water phantom was contrasted with the practical measurements and the reported values using the percent depth dose(PDD)curve and normal peak scatter factor.Results There Was no significant difference between calculated and measured results in the 10 cm×10 cm field(t＝-0.41,P>0.05),however,there were significant differences in the 5 cm×5 cm field(t=7.2,P<0.05)and in the 12 cm×12 cm field(t=-4.6,P<0.05).There was no significant difierence between the calculated results and the reported values(t=-1.91,P>0.05).In the same radiation field,the PDD decreased as the depth increased,but increased as the size of the radiation field increased at the same depth.PDD and normal peak scatter factor were both important parameters for calculation of prescribed dose.Conclusions It is possible to establish a set of accurate and comprehensive percent depth doses and normal peak scatter factor parameters so as to provide the basis of clinical use, quality assurance and quality control for radiotherapy.