While bearing the benefit of time efficiency,IMRT techniques face the deterioration of plan quality due to minimization of intensity modulation in exchange for fast delivery of treatment plan.In order to achieve an optimal compromise between plan quality and delivery efficiency,a variant of adaptive IMRT(A-IMRT) treatment planning technique is proposed in this study,which provides a solution to calculate a single-arc IMRT plan with the minimized numbers of beams of beams and the minimized levels of their intensities.Our results show that the proposed A-IMRT optimization technique provides an effective way to reach a single-arc plan with the best compromise between dose quality and delivery efficiency and competent for the applications of the upcoming surge of rapid delivery of treatment plan on the simulated abdomen phantom.%在仿真人体模上,通过增加照射野方向,利用自适应调强技术(A-IMRT)优化各方向上照射野强度,初步实现并验证了这种综合传统IMRT和VMAT技术优点,规避其缺点的自适应IMRT新技术(A-IMRT):为模拟临床,我们选取仿真体模中相对简单的腹部病兆,给予7个野照射45Gy为参照,算法中m被分别限定为1,2,3且最多30个子野(相对简单的腹部肿瘤30个子野通常可以达到较理想的结果).根据软件给出的计划难以指数显示plan20/20最容易达到,plan10/10最难达到.Plan 10/20与Plan10/30处于中位值附近,但与标准计划plan7/30相比,在难易程度上差距不大.且plan10/20和plan20/20在剂量断层分布和各感兴趣组织DVH图上都有较理想表现,在保证肿瘤处方剂量的基础上给予正常组织较小的剂量,有较好的保护作用.因此,利用计算机仿真技术,从传统IMRT技术着手,可实现介于IMRT与VMAT之间的自适应A-IMRT技术,并得到更优化的方案.这一技术通过验证具有可行性和高效性,这一点在仿真人腹部模型上得到较理想的结果.
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