马阳光,张可,胡志辉,宋一昕,戴建荣.利用加速器日志文件验证容积旋转调强放疗计划的可行性[J].中华放射医学与防护杂志,2012,32(3):285-288
利用加速器日志文件验证容积旋转调强放疗计划的可行性
Verification of volumetric-modulated arc therapy plan by log-file analysis of linear accelerator
投稿时间:2011-10-11  
DOI:10.3760/cma.j.issn.0254-5098.2012.03.016
中文关键词:  容积旋转调强放疗  日志文件  计划验证
英文关键词:Volumetric modulated arc therapy  Log-file  Verification of treatment plan
基金项目:国家自然科学基金(10975187)
作者单位E-mail
马阳光 430072 武汉大学物理科学与技术学院  
张可 中国医学科学院肿瘤医院放疗科  
胡志辉 中国医学科学院肿瘤医院放疗科  
宋一昕 中国医学科学院肿瘤医院放疗科  
戴建荣 中国医学科学院肿瘤医院放疗科 dai_jianrong@163.com 
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中文摘要:
      目的 明确利用容积旋转调强放疗(volumetric modulated arc therapy,VMAT)加速器的日志文件验证放疗计划技术的可行性。方法 加速器(Elekta Synergy)日志文件以二进制格式记录了加速器执行计划时每个控制点对应的机架角度、多叶准直器叶片位置、累积机器跳数(MU)等信息,利用Matlab7.1编写内部程序从加速器日志文件中读取这些信息,然后将原计划文件中各控制点的机架角度、多叶准直器叶片位置、累积MU替换为日志中对应信息,从而生成一个新的计划。将新计划导入到计划系统(Philips Pinnacle^3)中重新计算剂量。对比两者的剂量体积直方图(dose volume histogram, DVH)与剂量分布,判断加速器执行计划的准确性。结果 新计划与原计划相比,12个弧中有4个弧机架角度差别大于±1°的控制点,占整个弧控制点数目的比例约35%。对于所有弧,约95%控制点的叶片误差为±0.5 mm。单个控制点的MU误差较大,但每个弧的累积MU相差很小,所选12个弧的累积MU为-0.09%~0.11%。靶区最大剂量、最小剂量、平均剂量差别分别为-0.07%~0.42%、-0.38%~0.40%、0.03%~0.08%,危及器官最大剂量和平均剂量差别分别为-1.16%~2.51%、-1.21%~3.12%。结论 利用加速器日志文件验证VMAT计划的方法可作为实验测量方法的补充。
英文摘要:
      Objective To verify the dose delivery accuracy of volumetric-modulated arc therapy plan by log-file analysis of linear accelerator that can be created when a dynamic delivery occurs.Methods Accelerator log file in binary format recorded the accelerator execution plan for each control point corresponding to the gantry angle, multi-leaf collimator leave position, cumulative machine monitor units (MU). These information were read from the accelerator log file with Matlab7.1, then the original control points in the plan file replaced the corresponding information for the log, which generated a new plan. New plan was exported into the planning system to recalculate the dose. The volume dose histogram (DVH) and dose distribution was contrasted to determine the accuracy of the accelerator plan of implementation between two plans.Results Compared with the original plan, antry angle difference over ±1° accounted for about 35% of the entire arc of control points in 4 of 12 arcs and the percentage of the leave error of ±0.5 mm was about 95%. MU error of a single control point was larger, but the cumulative MU for each arc was small which was located between -0.09% to 0.11% in the selected 12 arcs. Between the targets, the maximum dose, minimum dose, the mean dose differences were from -0.07% to 0.42%, -0.38% to 0.40%, 0.03% to 0.08%, respectively. The maximum dose and mean dose differences of organs at risks were located from -1.16% to 2.51%, -1.21% to 3.12%, respectively.Conclusions Accelerator log-file analysis to verify the VMAT plan can be supplyed to the experimental method supplement.
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