CAJ | 학술논문

将多目标智能优化算法与梯度算法的进化策略有机结合,即对每一种群用梯度算法求解其下一代新群体,并采用实数运算,构造一种混合多目标梯度算法.利用测试函数分析算法的优劣,并将其应用于IMRT逆向计划过程.目标函数中的PTV和NT是基于平均计量分布,通过水模中的测试算例,得出强度分布.结果表明,该混合多目标梯度算法可节省大量计算时间且具有较高的计算精度,故能够满足实际应用的要求.
장다목표지능우화산법여제도산법적진화책략유궤결합,즉대매일충군용제도산법구해기하일대신군체,병채용실수운산,구조일충혼합다목표제도산법.이용측시함수분석산법적우렬,병장기응용우IMRT역향계화과정.목표함수중적PTV화NT시기우평균계량분포,통과수모중적측시산례,득출강도분포.결과표명,해혼합다목표제도산법가절성대량계산시간차구유교고적계산정도,고능구만족실제응용적요구.
The intelligent optimization of a multi-objective evolutionary algorithm is combined with a gradient al-gorithm.The hybrid multi-objective gradient algorithm is framed by the real number.Test functions are used to analyze the efficiency of the algorithm.In the simulation case of the water phantom,the algorithm is applied to an inverse planning process of intensity modulated radiation treatment (IMRT).The objective functions of plan-ning target volume (PTV) and normal tissue (NT) are based on the average dose distribution.The obtained in-tensity profile shows that the hybrid multi-objective gradient algorithm saves the computational time and has good accuracy,thus meeting the requirements of practical applications.