医科达Synergy加速器ⅩⅥ系统CBCT扫描头颈部模体的误差研究

The study of error in the head and neck phantom using the X-ray volumetric image system of Elekta Synergy accelerator with CBCT

目的 探讨医科达Synergy加速器ⅩⅥ系统图像自动匹配结果的准确性.方法 应用仿真模体ART头部进行仿真模拟计划设计后进行模体CBCT扫描,测量在不同匹配区域、不同匹配方法以及在不同方向上定量移床后扫描的匹配误差,获取数据进行分析.结果 在定量移床后模体扫描匹配误差与相应移床量数据基本吻合,x、y、z轴向总误差分别为（0.11±0.41）、（-0.04±2.6）、（0.28±0.74） mm.在不同匹配区域、不同匹配方法下进行自动匹配,各组数据差异较小.但对不同匹配区域、不同匹配方法上存在一些配对差异.结论 ⅩⅥ系统的自动匹配功能在头颈部应用上匹配精确,对偏移误差辨识准确可信度高.但对不同匹配区域、不同匹配方法上存在一定优劣对比,在实际运用中可根据实际情况择优应用.

Objective To investigate the accuracy and reliability of the image automatic matching using X-ray volumetric image （ⅩⅥ） system with the accelerator Elekta Synergy and to compare the matches with different methods and area.Methods A simulation plan using the head and neck phantom was designed and sent to ⅩⅥ system for CBCT scanning.During the scanning,the couch for certain distance was moved and the data of ⅩⅥ image automatic Matching in different matching methods and area was collected.Results The result of ⅩⅥ image automatic matching is consistent and correct to direction and distance which the couch had been moved （x：（0.11 ± 0.41） mm,y：（-0.04± 2.6） mm,z：（0.28 ± 0.74 mm））.There are not significant differences between the results that matching in different matching methods and different matching area.Conclusions The automatic image Matching of ⅩⅥ is accuracy and high reliability in recognition of offset error.But there are some significant differences on the automatic image Matching in different matching methods and different matching area.