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背景与目的:电子实时定位检验成像系统(EPID)是目前应用较多的用于分析放疗质控的工具。本研究比较技术员和医师应用EPID对摆位误差图像分析的差异,探讨技术员独立应用EPID进行摆位误差监测的可行性。方法:2005年5月—2005年8月,接受盆腔放疗12例患者。应用EPID拍摄每天前/后野,两侧野,共得到244组图像,数据由医师和技术员分别分析得到。结果:244组图像分析结果,医师和技术员在左右、前后和头脚3个方向数据分析的差异平均值分别为:(1.0±0.9)mm,(1.0±0.9)mm和(0.8±0.8)mm。两者间差异无显著性。结论:技术员可以应用EPID独立完成对盆腔摆位图像分析,进行误差的监测,为进一步进行自适应性放疗的开展积累经验。
Background and Objective: The Electronic Real-time Positioning Inspection Imaging System (EPID) is the most widely used tool for the analysis of radiotherapy quality control. This study compared the difference between technician and physician applying EPID to the setup error image analysis and discussed the feasibility of technician applying the EPID independently to monitor the setup error. Methods: From May 2005 to August 2005, 12 patients underwent pelvic radiotherapy. Using EPID to record daily anteroposterior / posterolateral and lateral field, a total of 244 images were obtained. Data were analyzed by physicians and technicians respectively. Results: The average data of 244 groups of images analyzed in the three directions of left, right, front and rear and head and head were (1.0 ± 0.9) mm, (1.0 ± 0.9) mm and (0.8 ± 0.8) mm. No significant difference between the two. Conclusion: The technician can use EPID to independently complete the image analysis of the pelvic position, monitor the error and accumulate experience for further adaptive radiotherapy.