| ArcCheck探测螺旋断层放疗误差的敏感性 |
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| 引用本文： | 闫冰,吴爱林,薛旭东,张红雁,吴爱东.ArcCheck探测螺旋断层放疗误差的敏感性[J].中国医学物理学杂志,2021,0(6):666-671. |
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| 作者姓名： | 闫冰 吴爱林 薛旭东 张红雁 吴爱东 |
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| 作者单位： | 1.中国科学技术大学附属第一医院/安徽省立医院放疗科， 安徽 合肥 230001； 2.中国科学技术大学附属第一医院西区/安徽省肿瘤医院放疗科， 安徽 合肥 230001 |
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| 摘 要： | 目的:针对螺旋断层放疗（HT）系统，分析ArcCheck验证患者计划通过率对治疗床运动速度误差、机架旋转周期误差、机架起始角度误差、多叶准直器叶片开启时间误差的敏感性。方法:选取9例行HT的鼻咽癌患者计划，由自编程序生成与原计划相对应的误差计划。应用点剂量及Gamma分析，计算得出上述误差的临床可检测误差值。结果:所有患者的原计划采用3%/2 mm、2%/1 mm标准时的平均Gamma通过率分别为97.49%±1.08%、73.38%±4.31%。应用3%/2 mm通过率标准时，可检测的最小误差分别为治疗床运动速度:-1.58%、1.38%（上下限阈值），机器旋转周期:-1.68%、1.31%（上下限阈值），机架起始角度误差:2.50°，多叶准直器叶片开启时间:1.62%。而应用2%/1 mm标准时，检测精度得到提升，可检测的最小误差分别为治疗床运动速度:-0.69%、1.27%，机器旋转周期:-0.69%、0.69%，机架起始角度误差:2.06°，多叶准直器叶片开启时间:0.52%。结论:ArcCheck与电离室测量点剂量联用与单独使用ArcCheck Gamma通过率相比并未表现出明显优势，ArcCheck可以检测出临床相关的照射误差，更为严格的Gamma通过率标准可以明显提高误差计划的检测精度。
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| 关 键 词： | 鼻咽癌 螺旋断层放疗 ArcCheck 质量保证 Gamma分析 |
Sensitivity of ArcCheck to detect dose delivery errors in helical tomotherapy |
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| YAN Bing,WU Ailin,XUE Xudong,ZHANG Hongyan,WU Aidong.Sensitivity of ArcCheck to detect dose delivery errors in helical tomotherapy[J].Chinese Journal of Medical Physics,2021,0(6):666-671. |
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| Authors: | YAN Bing WU Ailin XUE Xudong ZHANG Hongyan WU Aidong |
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| Affiliation: | 1. Department of Radiation Oncology, the First Affiliated Hospital of University of Science and Technology of China/Anhui Provincial Hospital, Hefei 230001, China 2. Department of Radiation Oncology, the First Affiliated Hospital of University of Science and Technology of China (West District)/Anhui Provincial Cancer Hospital, Hefei 230001, China |
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| Abstract: | Abstract: Objective To measure the passing rates of helical tomotherapy (HT) plan with ArcCheck, and to explore the sensitivity of ArcCheck to detect the errors which are introduced in couch movement, gantry rotation period, gantry starting angle and leaf open time. Methods The plans of 9 patients with nasopharyngeal carcinoma who underwent HT were analyzed. For each patient, error plan corresponding to the original plan was generated using a self-compiled program. Point dose and Gamma analysis were used for calculating clinically detectable errors. Results The average Gamma passing rates of the 9 original HT plans were 97.49%±1.08% and 73.38%±4.31% under the criteria of 3%/2 mm and 2%/1 mm, respectively. When adopting the criterion of 3%/2mm, the detectable errors were -1.58% and 1.38% (upper and lower thresholds) for couch movement, -1.68% and 1.31% (upper and lower thresholds) for gantry rotation period, 2.50° for gantry starting angle, 1.62% for leaf open time. When adopting the criterion of 2%/1mm, the detection accuracy was improved, and the corresponding minimum detectable errors were -0.69% and 1.27% for couch movement, -0.69% and 0.69% for gantry rotation period, 2.06°for gantry starting angle, and 0.52% for leaf open time, respectively. Conclusion Compared with ArcCheck only, the combination of ion chamber measurements with ArcCheck do not improve error detection accuracy. ArcCheck can be used to detect clinically relevant dose delivery errors. Selecting more strict criteria for Gamma passing rate calculation can significantly improve the detection accuracy of error plan. |
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| Keywords: | Keywords: nasopharyngeal carcinoma helical tomotherapy ArcCheck quality assurance Gamma analysis |
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