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影像设备与放疗技术发展的关系越来越紧密,而包含电子射野影像系统(electronic portal imaging device, EPID)的加速器已在放疗中得到了广泛使用,EPID始于20世纪80年代,是使用荧光显像系统获得兆伏级传输图像的技术,在放疗质量控制和质量保证中应用广泛:图像方面如摆位误差验证分析等,加速器自身方面如射野、等中心验证、多叶准直器位置和到位精度验证等,剂量方面如二维三维剂量验证等,同时也有部分用于实时图像引导和剂量引导放疗的尝试。近年来,EPID设备和相关软件发展更新迅速,本文就EPID在放疗中的应用研究进展进行综述。
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