摘要
目的探讨端对端(E2E)测试在直线加速器放射治疗质量控制中的应用,验证其可行性,为加速器质量控制提供一种新方法。方法采用放射治疗专用Philips Brilliance 16排大孔径CT模拟定位机获取Lucy头颈部模体影像,传输到Eclipse v.7.6(Varian Medical Systems)治疗计划系统进行图像重建,按照E2E测试计划要求设计调强计划。将装有EBT3胶片的Lucy头颈部模体分别置于Varian 23EX、Varian iX、Varian 600CD 3台直线加速器上,模拟执行计划。计划执行完毕后取出照射胶片,利用扫描仪扫描胶片,通过E2E软件分析扫描胶片给出测试结果。结果 Varian 23EX在左右方向偏差(Δx)、前后方向偏差(Δy)、头脚方向偏差(Δz)分别为(-0.41±0.25) mm、(-0.50±0.31) mm、(0.85±0.31) mm;Varian i X在Δx、Δy、Δz分别为(-0.35±0.69) mm、(0.09±0.26) mm、(1.14±0.44) mm;Varian 600CD在Δx、Δy、Δz分别为(0.00±0.61) mm、(-1.00±0.68) mm、(0.12±1.30) mm,Varian 23EX、Varian iX、Varian 600CD 3台直线加速器治疗总偏差分别为(1.13±0.22) mm、(1.39±0.13) mm、(1.64±0.28) mm,均满足加速器治疗偏差≤2 mm的要求。结论E2E测试应用于直线加速器放射治疗质量控制是可行的,测试结果是可信的,对于加速器综合质量控制具有非常高的使用价值。
Objective To explore the value of end-to-end(E2 E)testing in radiation therapy quality control for medical linear accelerator and verity its feasibility,providing new method for the quality control of linear accelerator.Methods The Philips Brilliance 16-row big bore CT simulation was used to acquire images of Lucy phantom,then images was transferred to Eclipse v.7.6(Varian Medical Systems)treatment planning system for reconstruction.According to requirements of E2 E testing,the Intensity-modulated radiation therapy plan was designed.The plan for phantom equipped with EBT3 films were carried out at Varian 23 EX,Varian i X,Varian 600 CD Linac,respectively.The irradiated films were scanned and E2 E testing software was used to show the test results.Results The set-up error at the direction of left(Δx),front(Δy)and top(Δz)for Varian 23 EX were(-0.41±0.25)mm,(-0.50±0.31)mm and(0.85±0.31)mm,respectively.The set-up error at direction ofΔx,Δy,Δz for Varian iX were(-0.35±0.69)mm,(0.09±0.26)mm and(1.14±0.44)mm,respectively.The set-up error at direction ofΔx,Δy,Δz for Varian 600 CD were(0.00±0.61)mm,(-1.00±0.68)mm and(0.12±1.30)mm,respectively.The comprehensive error for Varian 23 EX,Varian i X,Varian 600 CD Linac were(1.13±0.22)mm,(1.39±0.13)mm and(1.64±0.28)mm,respectively,which met requirements of treatment error≤2 mm for medical linear accelerator.Conclusion It is demonstrated that E2 E testing could be used in quality control for linear accelerator,and the test result is reliable.It has the higher application value for comprehensive quality control of medical linear accelerator.
作者
高文超
秦琪
曹井丽
杨涛
王紫璇
王骁
王军良
GAO Wen-chao;QIN Qi;CAO Jing-li;YANG Tao;WANG Zi-xuan;WANG Xiao;WANG Jun-liang(Department of Radiation Oncology,Fifth Medical Center of PLA General Hospital,Beijing 100071,China;Department of Radiation Oncology,First Medical Center of PLA General Hospital(Chinese PLA General Hospital),Beijing 100853,China)
出处
《生物医学工程与临床》
CAS
2019年第5期548-552,共5页
Biomedical Engineering and Clinical Medicine
