摘要
笔形束扫描式(Pencil Beam Scanning,PBS)质子系统使得质子调强技术得到了广泛的应用。该技术能更好地实现对危及器官的保护,但也给质子系统的质控带来了更大的挑战。为提高质控效率,评估了XRV-124锥形闪烁体探测器在PBS系统质控中的应用可行性。该探测器实现了单次摆位同时完成对束斑大小的测量、束流影像中心一致性的验证、Star-shot测试以及机械性能的检测等质控工作。对XRV-124探测器各项测量数据的结果进行了详细分析并与传统质控方法进行了对比,结果显示其在满足质控需求的同时,将质控时间缩短了2/3。该方法已成功应用于合肥离子医学中心Varian ProBeam质子放疗系统质控中,表明XRV-124探测器可广泛应用于国内同类型质子放疗系统,提升质控效率,降低频繁摆位引入的人为误差。
[Background]Pencil beam scanning(PBS)proton systems with a rotating gantry makes proton intensity modulation technology widely used for better protection of organs at risk,but it also brings greater challenges to the quality control of proton system.[Purpose]This study aims to verify the accuracy of an XRV-124 cone-shaped scintillation detector and to investigate its feasibility for use in PBS quality assurance(QA)procedures.[Methods]Firstly,according to the measurement principle of XRV-124,a single setup was implemented to measure the spot size, beam–X-ray coincidence, gantry angle, star-shot test, and mechanical accuracy simultaneously. Then, the spotsize and beam – X-ray coincidence were determined at the isocenter using the XRV-124 for 70~240 MeV atincrements of 10 MeV and at 30° increments for all gantry angles. The coincidence of the X-ray system and protonbeam was evaluated in the X and Y directions of the International Electrotechnical Commission coordinate system(IEC). Finally, the spot size and coincidence results were compared with those of the widely used Lynx detector,whereas the gantry angle results were compared with those of the proton treatment console (PTC). [Results] The spotsizes obtained using the XRV-124 and Lynx are in good agreement within 0.10 mm for each energy, and the resultsshow the same trend with a maximum deviation of 0.18 mm and 0.11 mm in the IEC-X and -Y directions,respectively. The gantry angles are less than 0.2° compared to those of the PTC. For the star-shot test, the average 3Dand 2D distances from the isocenter are 0.4 mm and 0.2 mm, respectively, meets the quality control requirements.The QA items can be completed in 90 min. [Conclusions] This method of this study has been successfully applied tothe QA of Varian ProBeam proton radiotherapy system in Hefei ion medical center, indicating that XRV-124 coneshapedscintillation detector can be widely used in the same type of proton radiotherapy system to improve the QAefficiency and reduce the human error caused by freque
作者
潘灵婧
顾先宝
王远远
张扬帆
卢晓明
刘志鹏
PAN Lingjing;GU Xianbao;WANG Yuanyuan;ZHANG Yangfan;LU Xiaoming;LIU Zhipeng(Hefei Ion Medical Center,the First Affiliated Hospital of University of USTC,Division of Life Sciences and Medicine,University of Science and Technology of China,Hefei 230088,China;Anhui Environmental Radiation Supervision Station,Hefei 230071,China;Ion Medical Research Institute,University of Science and Technology of China,Hefei 230088,China)
出处
《核技术》
EI
CAS
CSCD
北大核心
2024年第8期79-88,共10页
Nuclear Techniques
基金
合肥市卫生健康委员会应用医学研究重点项目(No.Hwk2023zd20)
合肥综合性国家科学中心资助~~。
关键词
笔形束扫描
质子放疗
质控
XRV-124
锥形闪烁体探测器
Pencil beam scanning(PBS)
Proton therapy
Quality assurance
XRV-124
Cone-shaped scintillation detector
