摘要
目的 研究对比笔形束质子放疗系统质控中束斑大小的测量方法。方法 使用Matrixx One二维平面电离室矩阵、Lynx-PT平面闪烁体探测器及XRV-124锥形闪烁体探测器-三种不同种类、不同形状的探测器对质子放疗系统中不同能量的质子束斑大小进行测量,并将测量结果与加速器验收时束斑大小结果进行对比。结果 Matrixx One的束斑大小测量结果与验收结果相比偏差较大,其中230 MeV时的最大偏差达到41.25%。而Lynx-PT和XRV-124的束斑测量结果与验收结果相比,最大偏差分别为-7.35%和3.69%,Lynx-PT测量结果相较于验收结果系统性偏小。结论 Lynx-PT和XRV-124均适用于质子放疗系统束斑大小的测量,Matrixx One适用于束斑尺寸较大的质子放疗系统,相较于Lynx-PT和Matrixx One, XRV-124在旋转治疗室单能单点束斑尺寸测量中更有优势。
Objective:This study aimed to compare different methods for measuring spot size for quality assurance in pencil beam scanning proton therapy system.Methods:Three different types of detectors,including Matrixx One two-dimensional plane ionization chamber array,Lynx-PT planar scintillator detector,and XRV-124 conical scintillator detector,were employed to measure spot sizes with different energies in the proton therapy system.The measured results were compared with the spot sizes obtained during commissioning and acceptance testing(CAT).Results:The spot size measurement results using Matrixx One showed significant deviations compared to CAT,with a maximum deviation of 230 MeV spot size at 41.25%.The maximum deviations for Lynx-PT and XRV-124 spot size measurements compared to CAT were-7.35%and 3.69%,respectively.Lynx-PT measurements consistently resulted in smaller spot sizes compared to CAT.Conclusion:Both Lynx-PT and XRV-124 are effective in measuring spot size in proton therapy systems,with Matrixx One optimized for larger spot sizes.In contrast,XRV-124,compared to Lynx-PT and Matrixx One,has an advantage in spot size measurement for rotational treatment rooms.
作者
鲍小静
郑多林
张晓强
苏祝平
Bao Xiaojing;Zheng Duolin;Zhang Xiaoqiang;Su Zhuping(Hefei Ion Medical Center,the First Affiliated Hospital of USTC,Division of Life Sciences and Medicine,University of Science and Technology of China,Hefei Anhui 230088,China)
出处
《生命科学仪器》
2024年第3期1-4,共4页
Life Science Instruments
关键词
笔形束质子放疗
质控
探测器
束斑大小
Pencil beam scanning proton therapy
Quality assurance
Detector
Spot size
