基于蒙特卡罗模拟的不同轴向长度不同晶体材料的PET灵敏度和散射分数研究  

Monte Carlo Simulation Study on Impact of AFOV and Crystal on Scatter Fraction and Sensitivity of PET

作　　者：袁波[1] 曲桂红 欧海峰[3] 赵书俊[1] YUAN Bo;QU Guihong;OU Haifeng;ZHAO Shujun(School of Physics and Microelectronics,Zhengzhou University,Zhengzhou 450001,China;Top Grade Healthcare,Beijing 100176,China;School of Science,Henan University of Technology,Zhengzhou 450001,China)

机构地区：[1]郑州大学物理学院(微电子学院),河南郑州450001 [2]北京大基康明医疗设备有限公司,北京100176 [3]河南工业大学理学院,河南郑州450001

出　　处：《原子能科学技术》2020年第12期2448-2453,共6页Atomic Energy Science and Technology

摘　　要：长轴向PET是未来PET的发展方向。本文根据NEMA NU2-2012标准利用蒙特卡罗模拟工具研究了不同轴向长度和不同晶体材料对PET灵敏度和散射分数的影响,并将模拟结果与实验结果进行了比较。结果表明,模拟结果与实验结果符合很好,验证了模拟的可靠性。灵敏度随轴向长度的增加而增加,但这种增加是非线性的,且在某一长度处变化最明显,不同的PET对应的灵敏度变化最明显的轴向长度也不同。灵敏度表现最好的晶体为LuAP,YAP晶体的灵敏度最低。晶体材料和轴向长度对散射分数均没有明显影响。Long axial field of view(AFOV)PET is the development direction of future PET.The purpose of this paper is to simulate PET using GATE toolkit to evaluate scatter fraction(SF)and sensitivity for different AFOV and different crystal materials according to NEMA NU2-2012 protocol.The simulation results were compared with the experimental results.The simulation results are in accordance with experimental results,and the reliability of the simulation is verified.As the AFOV increases,the sensitivity also increases,but this increase is non-linear and changes most significantly at a certain length,and the axial length of the most obvious sensitivity change is different for different PET.The crystal with the best sensitivity is LuAP,and the YAP crystal has the lowest sensitivity.The crystal material and AFOV have no significant impact on the scatter fraction.

关 键 词：蒙特卡罗模拟 PET NEMA标准 

分 类 号：TL99[核科学技术—核技术及应用]