[1]王琳,张建平,徐本华,等. VSI型射波刀质量保证及剂量学数据特征的单中心研究[J].中国医学物理学杂志,2018,35(12):1392-1398.[doi:DOI:10.3969/j.issn.1005-202X.2018.12.005]
　WANG Lin,ZHANG Jianping,XU Benhua,et al. Single center study of clinical dosimetry data characteristics and quality assurance of VSI CyberKnife[J].Chinese Journal of Medical Physics,2018,35(12):1392-1398.[doi:DOI:10.3969/j.issn.1005-202X.2018.12.005]
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 VSI型射波刀质量保证及剂量学数据特征的单中心研究()
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《中国医学物理学杂志》[ISSN:1005-202X/CN:44-1351/R]

卷:
35卷
期数:
2018年第12期
页码:
1392-1398
栏目:
医学放射物理
出版日期:
2018-12-24

文章信息/Info

Title:
 Single center study of clinical dosimetry data characteristics and quality assurance of VSI CyberKnife
文章编号:
1005-202X（2018）12-1392-07
作者:
 王琳1; 张建平1; 徐本华1; 李小波1; 2
 1.福建医科大学附属协和医院放疗科， 福建 福州 350001； 2.福建医科大学医学技术与工程学院， 福建 福州 350001
Author(s):
 WANG Lin1;  ZHANG Jianping1;  XU Benhua1;  LI Xiaobo1;  2
 1. Department of Radiation Oncology, Fujian Medical University Union Hospital, Fuzhou 350001, China; 2. College of Medical Technology and Engineering, Fujian Medical University, Fuzhou 350001, China
关键词:
 ; VSI型射波刀; 剂量学; 数据特征; 质量保证; 临床调试
Keywords:
 ; Keywords: VSI CyberKnife;  dosimetry;  data characteristics;  quality assurance;  clinical commissioning
分类号:
R318；R811.1
DOI:
DOI:10.3969/j.issn.1005-202X.2018.12.005
文献标志码:
A
摘要:
 目的：研究总结VSI型射波刀临床剂量学数据特征及质量保证测试规程。 方法：结合运行后相关经验，对福建医科大学附属协和医院于2017年6月安装的VSI型射波刀临床调试数据与参考数据进行回顾性对比分析。除离轴比，其余剂量学参数采集均基于PTW 60019探测器。 结果：自动质量保证测试与端到端测试均需综合离心率、三维误差值及总误差值3方面因素。可变准直器质量保证可选辐射变色胶片法和高空间分辨率探测器法，而基线测量推荐使用前者。源轴距为650、800、1 000 mm，固定准直器所有孔径其输出因子测量值和参考值的平均偏差分别为-1.27%、-0.21%和0.70%，其中5.0 mm/7.5 mm准直器偏差分别为-5.10%/-2.67%、-2.08%/-1.41%和-1.12%/0.06%。Iris以上数字分别对应为-1.88%、-0.74%、0.09%；-8.61%/-3.53%、-4.38%/-1.97%、-1.34%/-0.33%。两类准直器水表面处所有孔径的组织模体比平均测量值分别为-6.22%（Fixed）和-4.81%（Iris），且均小于参考值；除Iris 5.0 mm和7.5 mm，其他类型及孔径的离轴比测量值均呈现肩部和底部正偏差现象，且准直器孔径越大越明显。TRS 277报告标定结果比TRS 398小约2%。 结论：在临床调试与验收过程中应充分了解两类准直器尤其小准直器的特性，选择合适的调试规程和工具。
Abstract:
 Abstract: Objective To study and summarize the clinical dosimetry data characteristics and quality assurance commissioning procedure of VSI CyberKnife. Methods Combining the practical operating experience, a comparative analysis was carried out retrospectively on clinical commissioning data and reference data from VSI CyberKnife which installed in Fujian Medical University Union Hospital in June 2017. Except for off-center ratios, the clinical dosimetry data were obtained by PTW 60019 detector. Results Three factors, namely eccentricity, three-dimensional error and the total error, were comprehensively considered in automatic quality assurance and end-to-end test. Both radiochromic film and equivalently high spatial resolution detector were available for the quality assurance of Iris collimator, but the use of radiochromic film was strongly recommended when the baseline set of measurement was done. At source-axis distance of 650, 800 and 1 000 mm, the average deviation between measurements and reference values for output factors across all apertures in Fixed collimator were -1.27%, -0.21% and 0.70%, respectively. And for 5.0 mm/7.5 mm collimator, the deviations were -5.10%/-2.67%, -2.08%/-1.41% and -1.12%/0.06%, respectively. For Iris apertures, the corresponding deviations were -1.88%, -0.74%, 0.09%; -8.61%/-3.53%, -4.38%/-1.97% and -1.34%/-0.33%, respectively. At the surface of water, the mean values of tissue phantom ratios of two types of collimators were -6.22% (Fixed) and -4.81% (Iris), respectively, both less than reference values. Except for 5.0 mm and 7.5 mm Iris collimators, the measurement values of off-center ratios for those two types of collimators had a tendency that the shoulder and bottom of curves toward positive deviation, and that the deviation was more obvious with the increase of collimator sizes. The output of dose calibration of TRS 277 was about 2% smaller than that of TRS 398. Conclusion In commissioning and acceptance procedures of CyberKnife, the user should fully understand the characteristics of two types of collimators especially for smaller collimators, and then select the appropriate commissioning procedures and tools.

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备注/Memo

备注/Memo:
 【收稿日期】2018-07-21
【基金项目】福建省科技厅引导性项目（2016Y0044）
【作者简介】王琳，助理工程师，从事肿瘤放射物理工作，E-mail: 403787663@qq.com
【通信作者】李小波，副主任医师，从事肿瘤放射物理工作，E-mail: lixiaobo2004@126.com
更新日期/Last Update: 2018-12-24