中华放射医学与防护杂志
中華放射醫學與防護雜誌
중화방사의학여방호잡지
Chinese Journal of Radiological Medicine and Protection
2012年
3期
285-288
,共4页
马阳光%张可%胡志辉%宋一昕%戴建荣
馬暘光%張可%鬍誌輝%宋一昕%戴建榮
마양광%장가%호지휘%송일흔%대건영
容积旋转调强放疗%日志文件%计划验证
容積鏇轉調彊放療%日誌文件%計劃驗證
용적선전조강방료%일지문건%계화험증
Volumetric modulated are therapy%Log-file%Verification of treatment plan
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 Pinnacle3)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l2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.
目的 明確利用容積鏇轉調彊放療(volumetric modulated arc therapy,VMAT)加速器的日誌文件驗證放療計劃技術的可行性.方法 加速器( Elekta Synergy)日誌文件以二進製格式記錄瞭加速器執行計劃時每箇控製點對應的機架角度、多葉準直器葉片位置、纍積機器跳數(MU)等信息,利用Matlab7.1編寫內部程序從加速器日誌文件中讀取這些信息,然後將原計劃文件中各控製點的機架角度、多葉準直器葉片位置、纍積MU替換為日誌中對應信息,從而生成一箇新的計劃.將新計劃導入到計劃繫統( Philips Pinnacle3)中重新計算劑量.對比兩者的劑量體積直方圖(dose volume histogram,DVH)與劑量分佈,判斷加速器執行計劃的準確性.結果 新計劃與原計劃相比,12箇弧中有4箇弧機架角度差彆大于±1°的控製點,佔整箇弧控製點數目的比例約35％.對于所有弧,約95％控製點的葉片誤差為±0.5 mm.單箇控製點的MU誤差較大,但每箇弧的纍積MU相差很小,所選l2箇弧的纍積MU為-0.09％ ～0.11％.靶區最大劑量、最小劑量、平均劑量差彆分彆為-0.07％ ～0.42％、-0.38％ ～0.40％、0.03％～0.08％,危及器官最大劑量和平均劑量差彆分彆為-1.16％ ～2.51％、-1.21％ ～3.12％.結論 利用加速器日誌文件驗證VMAT計劃的方法可作為實驗測量方法的補充.
목적 명학이용용적선전조강방료(volumetric modulated arc therapy,VMAT)가속기적일지문건험증방료계화기술적가행성.방법 가속기( Elekta Synergy)일지문건이이진제격식기록료가속기집행계화시매개공제점대응적궤가각도、다협준직기협편위치、루적궤기도수(MU)등신식,이용Matlab7.1편사내부정서종가속기일지문건중독취저사신식,연후장원계화문건중각공제점적궤가각도、다협준직기협편위치、루적MU체환위일지중대응신식,종이생성일개신적계화.장신계화도입도계화계통( Philips Pinnacle3)중중신계산제량.대비량자적제량체적직방도(dose volume histogram,DVH)여제량분포,판단가속기집행계화적준학성.결과 신계화여원계화상비,12개호중유4개호궤가각도차별대우±1°적공제점,점정개호공제점수목적비례약35％.대우소유호,약95％공제점적협편오차위±0.5 mm.단개공제점적MU오차교대,단매개호적루적MU상차흔소,소선l2개호적루적MU위-0.09％ ～0.11％.파구최대제량、최소제량、평균제량차별분별위-0.07％ ～0.42％、-0.38％ ～0.40％、0.03％～0.08％,위급기관최대제량화평균제량차별분별위-1.16％ ～2.51％、-1.21％ ～3.12％.결론 이용가속기일지문건험증VMAT계화적방법가작위실험측량방법적보충.
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 reculculate 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 are 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 nan be supplyed to the experimental method supplement.
