%0 Journal Article
%T 电子射野影像装置在容积调强旋转放疗多叶准直器到位精度质控中的应用
%A 周晓艺
%A 王晓红
%A 谭文勇
%A 陈诚
%A 韩光
%J 肿瘤防治研究
%D 2015
%R 10.3971/j.issn.1000-8578.2015.03.011
%X 摘要 目的 研究利用电子射野影像装置（electronic portal imaging device，EPID）检测容积调强旋转放疗（volumetric-modulated arc therapy，VMAT）执行过程中多叶准直器（multileaf collimator，MLC）到位精度的方法。方法 随机选取了8例鼻咽癌患者的放疗计划进行分析，通过二维电离室矩阵进行剂量学验证，得到剂量验证通过率。借助Heimann Imaging Software拍摄软件和医科达Synergy直线加速器机载EPID，获取VMAT计划执行过程中MLC的到位信息，通过梯度检测算法获取MLC实际位置，并与VMAT计划中规定的MLC位置进行比较，得到MLC的位置误差，计算计划通过率。结果 8例鼻咽癌患者的放疗计划在评价标准为3%/3 mm时，剂量验证通过率是（94.8±2.1）%；当叶片到位误差允许值为1 mm时，叶片验证的通过率是（91.1±4.0）%。结论 8例VMAT计划全部通过了剂量验证，但仍存在不同程度的叶片到位误差，因此只对VMAT计划进行剂量验证是不够的，对VMAT计划剂量的验证需要对MLC进行专门的质量控制。通过EPID进行MLC到位精度的检测能够提供更详细、更深入的质控信息，为VMAT技术的开展提供更多的保障
%K 容积调强旋转放射治疗
%K 多叶准直器
%K 位置误差
%K 通过率
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%U http://www.zlfzyj.com/CN/abstract/abstract8444.shtml