Monte Carlo simulation for performance evaluation of detector model with a monolithic LaBr_(3)(Ce)crystal and SiPM array forγradiation imaging

作     者：Wei Lu Lei Wang Yong Yuan Ting Zhang Ge Tang Ming-Zhe Liu Xian-Guo Tuo Jing Ning Wei Lu;Lei Wang;Yong Yuan;Ting Zhang;Ge Tang;Ming-Zhe Liu;Xian-Guo Tuo;Jing Ning

作者机构：Chengdu University of TechnologyChengdu 610059China Sichuan University of Science and EngineeringZigong 643000China Beijing Institute of Radiation MedicineBeijing 100850China 

出 版 物：《Nuclear Science and Techniques》 (核技术（英文）)

年 卷 期：2022年第33卷第8期

页      面：163-174页

核心收录：

学科分类：082704[工学-辐射防护及环境保护] 08[工学] 0827[工学-核科学与技术] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (Nos. 41874121 and U19A2086) the major scientific instruments and equipment development project of the Ministry of Science and Technology,People’s Republic of China (No.2012YQ180118) the Sichuan Science and Technology Program (No.2018JY0181) Sichuan Science and Technology Miao-zi Project(Nos. 2021JDRC0107 and 2021JDRCO068) 

主　　题：Scintillation photons Monte Carlo SiPM array Spatial resolution Monolithic LaBr_(3)(Ce)crystal 

摘      要：In recent years,LaBr_(3)(Ce)crystals and silicon photomultipliers(SiPMs)have been increasingly used in radiation imaging.This study involved the establishment of a detector model with a monolithic LaBr_(3)(Ce)crystal and SiPM array forγ-radiation imaging on the GEANT4 platform.The optical process included in the detector model was defined by key parameters,such as the emission spectrum,scintillation yield,and intrinsic resolution of the LaBr_(3):5%Ce crystal,as well as the detection efficiency of the SiPM array.The response of the detector model to^(57)Co flooded field irradiation was simulated and evaluated.The radiation images generated by the detector model exhibited a compression effect that was very close to that on images acquired by the physical detector.The spatial resolution of the simulated detector closely approximates that of the physical experiment.A detector model without the optical process was also established for comparison with a detector using the optical process.Both were used in a near-field modified uniform redundant array(MURA)imaging system to acquire images of a point source and a ring source of^(57)Co at the center of the field-of-view of the imaging system.The spatial resolution and signal-to-noise ratio of the images that were reconstructed using the two detector models were determined and compared.Compared with the detector model without optical processes,although the images from the proposed detector model have slightly inferior signal-to-noise ratios and more artifacts,they are more consistent with the reconstructed versions of images acquired in real physical experiments.The results confirm that the detector model can be used to design aγ-radiation imaging detector and to develop an imaging algorithm that can significantly shorten the development time and reduce the cost.