自制肺部模体用于射波刀肺追踪E2E验证分析

E2E testing of Cyberknife lung tracking using a homemade lung phantom

目的 通过比较自制肺部模体与CIRS动态模体在射波刀肺追踪E2E测试中的测量结果,验证自制肺部模体用于射波刀质量控制检测的可行性。方法 模拟患者治疗流程,分别对自制肺部模体与CIRS模体进行CT定位、计划设计、实施照射、扫描胶片并进行分析,上述两种模体在S7代射波刀上使用MLC各重复测量5次,在M6代射波刀上使用Iris也分别重复测量5次,对实验结果使用独立样本t检验分析方法分析两种模体测量结果的差异。结果 对于S7代射波刀,两种模体在X轴、Y轴、Z轴和总偏差上的检测值统计学分析结果分别为:P=0.236、0.175、0.289、0.668;对于M6代射波刀,所得分析结果分别为:P=0.880、0.891、0.573、0.433。以上P值均> 0.05。因此自制肺部模体与CIRS模体在S7代射波刀与M6代射波刀上的检测结果差异均无统计学意义;总偏差值均<1.5 mm。结论 自制肺部模体与CIRS模体在射波刀肺追踪的E2E实验中,测量结果具有一致性,满足AAPM TG-135报告和WS 667—2019标准中的要求,具有用于射波刀临床质控的可行性。

Objective To verify the feasibility of using a homemade lung phantom for quality control of Cyberknife by comparing the measurement results of the homemade lung phantom and CIRS dynamic phantom in E2E testing of Cyberknife lung tracking.Methods The patient treatment process was simulated,including CT positioning,plan design,irradiation implementation,film scanning,and analysis using the homemade phantom and CIRS phantom.The two phantoms were measured five times using MLC under the S7 generation Cyberknife and five times using Iris under the M6 generation Cyberknife.The differences in measurement results between the two phantoms were analyzed using independent sample ttest.Results For the S7 generation Cyberknife,the statistical analysis of differences between the two phantoms in the detection values on the X-axis,Y-axis,Z-axis,and total deviation showed P values of 0.236,0.175,0.289,and 0.668,respectively.For the M6 generation Cyberknife,the statistical analysis showed P values of 0.880,0.891,0.573,and 0.433,respectively.The P values were all>0.05.Therefore,there were no statistically significant differences in the detection results between the homemade lung phantom and the CIRS phantom under the S7 and M6 generation Cyberknife.The total deviation values were<1.5 mm.Conclusion The homemade lung phantom and CIRS phantom have consistent measurement results in the E2E testing of Cyberknife lung tracking and meet the requirements of Report of AAPM TG-135 and WS 667-2019 standard.Therefore,the homemade lung phantom is feasible for clinical quality control of Cyberknife.