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目的:探讨使用三维蓝水箱(BPH)扫描测量系统完成螺旋断层加速器设备的剂量分布检测。方法:使用BPH和Omni Pro-Accept 7.5软件对螺旋断层加速器40.0 cm×1.0 cm、40.0cm×2.5 cm及40.0 cm×5.0 cm三种射野下的百分深度剂量、射野横向截面和纵向截面射束离轴剂量分布进行数据采集,并将采集数据与厂商所给出的金标准进行比较,并对其两者差异进行分析。结果:不同深度处的百分深度剂量(PDD),无论在建成区域还是在其他深度处BPH测量的数据与金标准数据很好的吻合,差异<2%。对于射野离轴剂量分布,三种射野下的射野宽度和半影偏差全部在1.0 mm以内。BPH采集的数据与厂商所给的金标准数据具有很好的一致性。结论:BPH三维水箱与常规水箱比具有摆位简单、检测速度快以及精确性高等优点,所采集的数据与厂商给出金标准数据具有很好的一致性,可完成针对螺旋断层加速器的特殊线束分布进行针对性极强的数据采集和质量控制检测工作。
Objective: To investigate the dose distribution of helical tomosynthesis device using three-dimensional blue water tank (BPH) scanning and measuring system. METHODS: The percent depth dose, field cross-section and longitudinal cross-section of three kinds of fields of 40.0 cm × 1.0 cm, 40.0 cm × 2.5 cm and 40.0 cm × 5.0 cm of spiral tomography were measured by BPH and Omni Pro-Accept 7.5 software. Beam off-axis dose distribution data acquisition, and the collection of data and manufacturers to give the gold standard comparison, and their differences are analyzed. Results: The PDD at different depths showed good agreement between the BPH measurements and the gold standard data, both in the built-up area and at other depths, with a difference of <2%. For the off-axis dose distribution, the field width and penumbra deviations of the three fields are all within 1.0 mm. The data collected by BPH is in good agreement with the gold standard data provided by the manufacturer. Conclusion: Compared with conventional water tank, BPH three-dimensional water tank has the advantages of simple setting, high detection speed and high accuracy. The collected data are in good agreement with the gold standard data provided by the manufacturer, and the special wiring harness for the spiral tomography accelerator can be completed Distribution of highly targeted data acquisition and quality control testing.