统计过程控制方法在放疗患者计划质控中的应用
Application of statistical process control method in radiotherapy patient plans quality assurance
刘礼东 1郑乐 1钟美佐 1李书舟 2李军烽 1秦勤 1陈俊 1张校铭1
作者信息
- 1. 湘雅常德医院肿瘤科,常德 415000
- 2. 中南大学湘雅医院肿瘤科,长沙 410008
- 折叠
摘要
目的 运用统计过程控制(SPC)方法建立基于电子射野影像设备(Electronic Portal Imaging Device,EPID)在不同部位、不同放疗技术下使用3%/2mm和3%/3mm基准进行伽马分析的容差限值与干预限值.方法 分别选取头颈部、胸部、腹部及其他部位的129 例IMRT计划和89 例VMAT计划使用EPID进行剂量验证,根据每个部位前20 例患者计划的伽马通过率结果计算对应的容差限值与干预限值,绘制相应的单值控制图,实时监测各部位所有计划在不同测量基准下的伽马通过率.结果 两种放疗技术在3%/3mm基准下,各部位的容差下限均大于97%,干预下限均接近于97%.3%/2mm基准下,各部位的容差下限均大于94%,干预下限均大于92%.结论 SPC方法能够实时、有效的监测改进放疗患者计划质控流程,制定不同部位、不同放疗技术在不同测量基准下的个体化容差干预限值,降低失误风险,减少临床事故的发生.
Abstract
Objective Statistical process control(SPC)method was used to establish tolerance limits and action limits based on EPID for gamma analysis using 3%/2mm and 3%/3mm criterias at different sites and different radiotherapy techniques.Methods 129 IMRT plans and 89 VMAT plans including head and neck,chest,abdomen and other sites were selected for dose verification by EPID,The tolerance limits and action limits were calculated based on the gamma passing rate results of the first 20 patients plans for each site.The individual control charts were drawn to continuously monitor the gamma passing rate of all plans in different sites under different measurement criterias.Results Under the criteria of 3%/3mm,the tolerance limits of each site of the two techniques were greater than 97%,and the action limits were close to97%.The criteria of 3%/2mm,the tolerance limits of each site were greater than94%,and the action limist were greater than 92%.Conclusion SPC can effectively monitor and improve the quality control process of patient plans and setting individual tolerance limits and action limits in different sites,different radiotherapy techniques and different measurement criterias,it can reduce the risk of mistakes and lower the occurrence of clinical accidents.
关键词
统计过程控制方法/患者质量控制保证/伽马通过率/容差限值/干预限值Key words
Statistical process control method/Patient-specific quality assurance/Gamma passing rate/Tolerance limits/Action limits引用本文复制引用
出版年
2024
NETL
NSTL
万方数据