[1]刘礼东,李军烽,李书舟,等.统计过程控制方法在加速器日常输出剂量稳定性中的研究[J].中国医学物理学杂志,2021,38(2):138-142.[doi:DOI:10.3969/j.issn.1005-202X.2021.02.002]
　LIU Lidong,LI Junfeng,LI Shuzhou,et al.Statistical process control method in evaluating the stability of daily output dose of linear accelerator[J].Chinese Journal of Medical Physics,2021,38(2):138-142.[doi:DOI:10.3969/j.issn.1005-202X.2021.02.002]
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统计过程控制方法在加速器日常输出剂量稳定性中的研究()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
38卷
期数:
2021年第2期
页码:
138-142
栏目:
医学放射物理
出版日期:
2021-02-02

文章信息/Info

Title:
Statistical process control method in evaluating the stability of daily output dose of linear accelerator
文章编号:
1005-202X（2021）02-0138-05
作者:
刘礼东1; 李军烽1; 李书舟2; 钟美佐1; 秦勤1; 郑乐1; 唐杜2; 张校铭1
1.湘雅常德医院肿瘤科， 湖南 常德 415000； 2.中南大学湘雅医院肿瘤科， 湖南 长沙 410008
Author(s):
LIU Lidong1;  LI Junfeng1;  LI Shuzhou2;  ZHONG Meizuo1;  QIN Qin1;  ZHENG Le1;  TANG Du2;  ZHANG Xiaoming1
1. Department of Oncology, Xiangya Changde Hospital, Changde 415000, China 2. Department of Oncology, Xiangya Hospital, Central South University, Changsha 410008, China
关键词:
医用直线加速器; 统计过程控制方法; 质量控制; 输出剂量稳定性
Keywords:
Keywords: linear accelerator statistical process control method quality control output dose stability
分类号:
R811
DOI:
DOI:10.3969/j.issn.1005-202X.2021.02.002
文献标志码:
A
摘要:
目的：运用统计过程控制（SPC）方法研究医用直线加速器6 MV X射线输出剂量稳定性。方法：使用PTW QUICKCHECK webline晨检仪采集湘雅常德医院Varian Trilogy加速器2019年1月~12月257个工作日的6 MV X射线的中心轴输出剂量，使用SPC方法绘制均值-极差控制图（[X]-R图），将样本大小设定为2，观察129个样本点分布情况并计算过程能力指数（CP和CPK）判断加速器6 MV X射线输出剂量稳定性情况。结果：129个样本点中存在3个超过上控制线的数据异常点（119号、121号以及122号），提示物理师在此时间段内需人为干预调整输出剂量，过程能力指数CP=1.48和CPK=1.35，表明加速器6 MV X射线中心轴输出剂量在整个测量过程中处于稳定可控水平。结论：SPC方法可以实现对医用加速器6 MV X射线输出剂量的日常运行监测评估，为加速器质量管理提供信息参考依据，保证加速器运行处于安全稳定状态。
Abstract:
Abstract: Objective To study the stability of the 6 MV X-ray output dose of linear accelerator using statistical process control (SPC) method. Methods PTW QUICKCHECK webline was used to collect the 6 MV X-ray central-axis dose of the Varian Trilogy accelerator in Xiangya Changde Hospital within 257 working days during January to December 2019. SPC method was used to draw the mean-range control chart ([X]-R chart). The distribution of 129 sample points was obtained with the sample size of 2, and the process capability indexes (Cp and CPK) to determine the stability of output dose of the accelerator were calculated. Results Three out of 129 sample points exceeded the upper control line (points 119, 121 and 122), which remaindered the physicists to adjust the output dose during these periods. The calculated Cp=1.48 and CPK=1.35 indicated that the 6 MV X-ray central-axis dose of the accelerator was stable and was at a controllable level during the measurement. Conclusion SPC method can be used to monitor and evaluate the stability of daily output dose of linear accelerator, thereby providing critical information for quality management and ensuring the safe and stable operation of linear accelerator.

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备注/Memo

备注/Memo:
【收稿日期】2020-07-20 【基金项目】国家自然科学基金（61906215） 【作者简介】刘礼东，硕士，物理师，主要研究方向：医学物理，E-mail: liulidong1114@163.com 【通信作者】李军烽，E-mail: 83550245@qq.com
更新日期/Last Update: 2021-02-02