一种医用直线加速器机械参数测量分析系统
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摘要
目的:设计并实现一种医用直线加速器的机械参数测量系统,可对医用直线加速器等中心等各项机械参数进行测量并定量分析。方法:系统硬件采用双目光学测量套件,在加速器各部件上贴上定位小球,双目相机以20 Hz频率输出定位小球的空间坐标。软件上位机根据定位小球坐标实时更新加速器三维模型和各部件运动参数的拟合,实现对医用直线加速器的运动跟踪功能。完成测量后,软件可以输出测量分析报告,报告内容包括加速器各部件机械运动参数和反映性能的特征量,测量精度达0.5 mm。结果:实现本系统后,在两家医院对两台不同使用时长医用直线加速器分别进行多次测量和分析,得到等中心误差、机架机械运动参数和统计量、治疗床机械运动参数和统计量、机架和治疗床重复运动误差等。结论:本系统可帮助技术人员和物理师进行加速器维护工作,为医用直线加速器的日常检测和质量控制提供指导。
Objective To design and implement a mechanical parameter measurement system that can measure and quantitatively analyze the isocenter and other mechanical parameters of medical linear accelerators. Methods The hardware of the system adopted binocular optical measurement kit. A positioning ball was attached to the components of the accelerator. The binocular camera output the spatial coordinates of the positioning ball at a frequency of 20 Hz. According to the coordinates, the fitting of threedimensional model of the accelerator and the movement parameters of each component was updated with software, thereby realizing the motion tracking on medical linear accelerators. When the measurement was completed, the software output the measurement analysis report which included the mechanical motion parameters of various components of the accelerator and the characteristic variables which could reflect the performance. The measurement accuracy was up to 0.5 mm. Results After the system was established, multi-measurement and analysis were conducted on two medical linear accelerators that had been working for different hours in two hospitals. The accelerators were separately measured and analyzed to obtain the isocenter errors,mechanical motion parameters of gantry and treatment couch and their statistics, repeatability errors of gantry and treatment couch,etc. Conclusion The proposed system can effectively assist technicians and physicists in the maintenance of accelerators and provide guidance for daily inspection and quality control of medical linear accelerators.
Objective To design and implement a mechanical parameter measurement system that can measure and quantitatively analyze the isocenter and other mechanical parameters of medical linear accelerators. Methods The hardware of the system adopted binocular optical measurement kit. A positioning ball was attached to the components of the accelerator. The binocular camera output the spatial coordinates of the positioning ball at a frequency of 20 Hz. According to the coordinates, the fitting of threedimensional model of the accelerator and the movement parameters of each component was updated with software, thereby realizing the motion tracking on medical linear accelerators. When the measurement was completed, the software output the measurement analysis report which included the mechanical motion parameters of various components of the accelerator and the characteristic variables which could reflect the performance. The measurement accuracy was up to 0.5 mm. Results After the system was established, multi-measurement and analysis were conducted on two medical linear accelerators that had been working for different hours in two hospitals. The accelerators were separately measured and analyzed to obtain the isocenter errors,mechanical motion parameters of gantry and treatment couch and their statistics, repeatability errors of gantry and treatment couch,etc. Conclusion The proposed system can effectively assist technicians and physicists in the maintenance of accelerators and provide guidance for daily inspection and quality control of medical linear accelerators.
引文
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[17]张晓军,吴文魁.放射治疗中的质量保证与质量控制[J].中国医疗设备,2009,24(11):83-85.ZHANG X J,WU W K.Quality assurance and quality control in radiotherapy[J].China Medical Devices,2009,24(11):83-85.
[18]周怀恒,陈雄,杨康基.医用直线加速器的基本结构和日常保养[J].医疗装备,2016,29(3):80-81.ZHOU H H,CHEN X,YANG K J.Basic structure and daily maintenance of medical linear accelerator[J].Chinese Journal of Medical Device,2016,29(3):80-81.
[19]MUTIC S,PALTA J R,BUTKER E K,et al.Quality assurance for computed-tomography simulators and the computed-tomographysimulation process:report of the AAPM Radiation Therapy Committee Task Group No.66[J].Med Phys,2003,30(10):2762-2792.
[20]International Organization for Standardization.Quality management and quality assurance standards:part I,guidelines for selection and use[S].Geneva:ISO,1994.
[2]林艳萍,张文强,王成焘.手术导航系统中器械的可视化与实时跟踪[J].生物医学工程学杂志,2006,23(5):995-998.LIN Y P,ZHANG W Q,WANG C T.Visualization and real-time tracking of the instruments in surgical navigation system[J].Journal of Biomedical Engineering,2006,23(5):995-998.
[3]高枫.医用电子直线加速器的性能检测与质量保证[J].现代医药卫生,2006,22(6):797-798.GAO F.Examining the performance and quality assurance of linear accelerator[J].Modern Medicine&Health,2006,22(6):797-798.
[4]许峰,陈薇薇.医用直线加速器技术简述[J].中国医疗设备,2011,26(4):85-86.XU F,CHEN W W.The brief desciption of medical linear accelerator technology[J].China Medical Devices,2011,26(4):85-86.
[5]JUNKER G.Pro OGRE 3D Programming[M].Berkeley:Apress,2006.
[6]Kitware,Inc.The VTK usersguide-11th edition[M].Kitware,Inc.,2010.
[7]WILES A D,THOMPSON D G,FRANTZ D D.Accuracy assessment and interpretation for optical tracking systems[C]//Proceedings of SPIE-the International Society for Optical Engineering Visualization.SPIE,2004,5367:421-432.
[8]REINSTEIN L E,WELSH K.Quality assurance system for a medical linear accelerator:US6626569B2[P].2003-09-30.
[9]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.医用电子加速器性能和试验方法:GB15213-2016[S].北京:中国标准出版社,2016.General Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China,Standardization Administration of the People's Republic of China.Medical electron accelerators-functional performance characteristics and test methods:GB15213-2016[S].Beijing:Standards Press of China,2016.
[10]中华人民共和国国家质量监督检验检疫总局,中国国家标准化管理委员会.医用电子加速器验收试验和周期检验规程:GB/T 19046-2013[S].北京:中国标准出版社,2014.General Administration of Quality Supervision,Inspection and Quarantine of the People's Republic of China,Standardization Administration of the People's Republic of China.Medical electron accelerators-acceptance and periodic tests:GB/T 19046-2013[S].Beijing:Standards Press of China,2014.
[11]刘鹏,于维海,肖开敏.医用直线加速器的质量保证和质量控制[J].中国医疗设备,2010,25(9):97-98.LIU P,YU W H,XIAO K M.Quality assurance and quality control of medical linear accelerator[J].China Medical Devices,2010,25(9):97-98.
[12]魏绪国,王贵富,李修磊,等.新型放疗用激光灯安装校准工具介绍[J].中国医疗设备,2011,26(6):101.WEI X G,WANG G F,LI X L,et al.Introduction of an installation and calibration device for radiotherapy laser lamp[J].China Medical Devices,2011,26(6):101.
[13]王杰,张玉海,王康,等.医用直线加速器的设备维护及治疗安全[J].中国医疗设备,2012,26(6):20-22.WANG J,ZHANG Y H,WANG K,et al.Maintenance and treatment safety of medical linear accelerator[J].China Medical Devices,2012,26(6):20-22.
[14]王振军,王燕,刘志成.应用根本原因分析法控制直线加速器医疗质量的尝试[J].中国医疗设备,2011,26(10):100-103.WANG Z J,WANG Y,LIU Z C.Tentative research on quality control of medical linear accelerator using root cause analysis[J].China Medical Devices,2011,26(10):100-103.
[15]郑富强,王捷.医用直线加速器概况与进展[J].医疗设备信息,2005,20(4):30-31.ZHENG F Q,WANG J.Summary of medical linear accelerator and its progress[J].Information of Medical Equipment,2005,20(4):30-31.
[16]HANSON W F,ANDERSON L L,LING C C,et al.Physical aspects of quality assurance in radiation therapy:AAPM report[R].New York:American Institute of Physics,1994.
[17]张晓军,吴文魁.放射治疗中的质量保证与质量控制[J].中国医疗设备,2009,24(11):83-85.ZHANG X J,WU W K.Quality assurance and quality control in radiotherapy[J].China Medical Devices,2009,24(11):83-85.
[18]周怀恒,陈雄,杨康基.医用直线加速器的基本结构和日常保养[J].医疗装备,2016,29(3):80-81.ZHOU H H,CHEN X,YANG K J.Basic structure and daily maintenance of medical linear accelerator[J].Chinese Journal of Medical Device,2016,29(3):80-81.
[19]MUTIC S,PALTA J R,BUTKER E K,et al.Quality assurance for computed-tomography simulators and the computed-tomographysimulation process:report of the AAPM Radiation Therapy Committee Task Group No.66[J].Med Phys,2003,30(10):2762-2792.
[20]International Organization for Standardization.Quality management and quality assurance standards:part I,guidelines for selection and use[S].Geneva:ISO,1994.
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