CAJ | 학술논문

目的利用多叶准直器(MLC)质量保证(QA)模体,对Truebeam加速器执行常规质量保证程序,检验MLC在治疗计划执行过程中的可靠性.方法 MLC QA模体是对MLC进行质量保证的专用模体,呈“L”形,嵌有5颗实心钢珠.模体在Truebeam加速器治疗床上进行摆位.在Eclipse vl0.0治疗计划系统中,创建一个QA计划,包含叶片位置检测、叶片宽度检测、Multi-Port检测和叶片间漏射检测等信息.通过电子射野影像系统(EPID),获取MLC和模体的影像.按同样的操作对MLC执行每周1次,共6周的检测,并将影像导人PIPSpro软件进行分析.结果叶片位置检测的误差结果为(0.21±0.02)mm;叶片宽度检测的误差结果为(0.04±0.02)mm;Multi-Port检测的误差结果为(0.26±0.04)mm;叶片透射检测叶片间的漏射结果为1.0％±0.14％.结论 Truebeam加速器的MLC系统运行状态良好,MLC QA模体是一个简单实用的质量保证工具.
목적 이용다협준직기(MLC)질량보증(QA)모체,대Truebeam가속기집행상규질량보증정서,검험MLC재치료계화집행과정중적가고성.방법 MLC QA모체시대MLC진행질량보증적전용모체,정“L”형,감유5과실심강주.모체재Truebeam가속기치료상상진행파위.재Eclipse vl0.0치료계화계통중,창건일개QA계화,포함협편위치검측、협편관도검측、Multi-Port검측화협편간루사검측등신식.통과전자사야영상계통(EPID),획취MLC화모체적영상.안동양적조작대MLC집행매주1차,공6주적검측,병장영상도인PIPSpro연건진행분석.결과 협편위치검측적오차결과위(0.21±0.02)mm;협편관도검측적오차결과위(0.04±0.02)mm;Multi-Port검측적오차결과위(0.26±0.04)mm;협편투사검측협편간적루사결과위1.0％±0.14％.결론 Truebeam가속기적MLC계통운행상태량호,MLC QA모체시일개간단실용적질량보증공구.
Objective To perform a routine quality assurance procedure for Truebeam multi-leaf collimator (MLC) using MLC quality assurance (QA) phantom,verifying the reliability of MLC during the treatment.Methods MLC QA phantom was a specialized phantom for multi-leaf collimator QA,and contained five radio-opaque spheres that were embedded in an L-shape.The phantom was placed isocentrically on the Truebeam treatment couch for the tests.A quality assurance plan was settled up in the Eclipse v10.0 so that the fields for acquiring the necessary images could be created.The images were acquired by the electronic portal imaging device (EPID),and imported into the PIPSpro software for the analysis.The tests were delivered once a week for six weeks to verify consistency of the delivery,and the images were acquired in the same manner each time.Results For the leaf position test,the average position error was (0.21 ± 0.02) mm.The leaf width was measured at the isocenter,and the average error was (0.04±0.02) mm for the leaf width test.Multi-Port test showed the dynamic leaf shift error,the average error was (0.26 ± 0.04) mm.For the leaf transmission test,the average inter-leaf leakage value was 1.0％ ± 0.14％.Conclusions The MLC system of Truebeam could operate very well and the QA phantom is a useful test tool for the MLC QA.