螺旋断层治疗系统的质量保证

螺旋断层治疗系统(HT)是一种集调强放射治疗和影像引导放射治疗于一体的放射治疗系统,是目前最先进的放疗设备之一。考虑其与常规直线加速器质量保证的差异,由国家癌症中心/国家肿瘤质控中心提出,多家医疗单位共同参与制定了本指南。指南包括国内医疗机构HT用于临床工作的验收项目、操作制度、应急预案等内容,明确了质量控制的测试方法、评价标准、检测频率。指南结合国内医疗单位实际情况给出了推荐性检测项目,主要包括机械精度、剂量输出与分布、激光定位系统、治疗床运动精度、MVCT影像系统质控检测、临床治疗计划验证等具体实施方法步骤,使得指南具有很强的可操作性。本指南能给临床工作人员提供质量保证技术指导,使HT质量保证工作有章可循,可提高放射治疗的准确性和精度。对国内各医疗机构建立规范HT质量保证体系具有指导意义。

Quality assurance of helical tomotherapy

Helical Tomotherapy combines a form of intensity-modulated radiation therapy (IMRT) with the accuracy of computed tomography (CT) scanning technology in one machine. HT is one of the most advanced radiotherapy equipments at present. Considering the difference from the quality assurance of conventional linear accelerators, this guideline was proposed by National Cancer Center/National Cancer Quality Control Center, and multiple medical institutions participated in the formulation of this guideline. The guideline includes the acceptance items, operating rules and emergency plans, etc. The test methods, tolerances and frequencies of HT quality assurance are clarified. According to the actual situation of domestic medical institutions, the guideline provides recommended testing items, mainly including mechanical accuracy, dosimetric parameters, laser system, couch motion accuracy, MVCT imaging system quality control testing and clinical treatment plan verification, etc., making the guideline highly operable. This guideline can provide clinical phycicians with technical guidance on quality assurance, make quality assurance work rule-based, and improve the accuracy and precision of radiotherapy. It has instructive implications for medical institutions to establish standardized HT quality assurance system.