新型加速器Halcyon 2.0使用前的验收测试

Pre-Use Acceptance and Testing of New Type Halcyon 2.0

目的探讨治疗计划系统(Treatment Planning System,TPS)预装典型射线数据Halcyon 2.0直线加速器验收流程,确保测试结果满足临床治疗要求,同时验证预装数据的可靠性。方法根据Halcyon加速器特点,按照出厂手册以及常规加速器、TPS验收实践,结合国内外验收标准,从直线加速器临床调试、TPS验收和患者验证测试3个方面进行质量控制,同时将我院加速器测量剂量学参数与预装数据和外院数据进行比较。结果该直线加速器机械性能、图像质量均符合出厂标准。我院测量最大剂量深度为1.19 cm(预装:1.30 cm,外院:1.40 cm),在(1.30±0.20)cm以内。10 cm深度处的百分深度剂量(Percentage Depth Dose,PDD)为62.97%(预装:63.00%,外院:63.50%),在63.0%±1.00%以内。射野10 cm×10 cm的PDD和离轴比(Off Axial Ratio,OAR)与预装数据具有较好的一致性。射野28 cm×28 cm的离轴10 cm的径向和横向OAR以及对称性均满足出厂标准。结论Halcyon 2.0加速器测量数据与TPS预装数据以及外院测量数据具有较好一致性,临床测试结果均满足国内外标准,可投入临床使用。

Objective To explore the acceptance process of Halcyon 2.0 linear accelerator preloading typical ray data in treatment planning system(TPS),to ensure that test results meet clinical treatment requirements.At the same time,to verifie the reliability of pre-installed data.Methods According to the characteristics of Halcyon 2.0 accelerator and the factory manual,the conventional accelerator and TPS acceptance practice,combined with the domestic and foreign acceptance standards,quality control was conducted from three aspects:clinical commissioning of linear accelerator,TPS acceptance and patient verification test.Meanwhile,the measured dosimetric parameters were compared with pre-installed data of our hospital’s accelerators and external hospital.Results The mechanical properties and image quality of this Halcyon linear accelerator met the factory standard.The maximum dose depth of our hospital was 1.19 cm(the pre-installed data:1.30 cm,external hospital:1.40 cm),which was within(1.30±0.20)cm.The percentage depth dose(PDD)was 62.97%at 10 cm depth(the pre-installed data:63.00%,external hospital:63.50%),which was within 63.0%±1.00%.The PDD and off axial ratio(OAR)of 10 cm×10 cm field had good consistency with the data of the preinstalled data.Radial and lateral OAR and symmetry of 28 cm×28 cm field at off-axis 10 cm met factory standards.Conclusion The measurement data of Halcyon 2.0 linear accelerator is in good consistency with the pre-installed data of TPS and the measurement data of external hospital.The clinical test results all meet domestic and foreign acceptance standards and can be put into clinical use.