一种纵、横向视野不同的编码孔径伽玛相机的方法论述与模拟验证

辐射防护 ›› 2022, Vol. 42 ›› Issue (6): 548-555.

一种纵、横向视野不同的编码孔径伽玛相机的方法论述与模拟验证

李岩, 刘立业, 曹勤剑, 赵原, 夏三强, 董佳杰

中国辐射防护研究院,太原 030006

收稿日期:2022-05-06 出版日期:2022-11-20 发布日期:2023-01-05
通讯作者: 刘立业。E-mail: liuliye@cirp.org.cn
作者简介:李岩(1994—),男,2017年毕业于成都理工大学辐射防护与核安全专业,2020年毕业于成都理工大学核技术及应用专业,获硕士学位,研究实习员。E-mail:762854161@qq.com
基金资助:
大型公众活动核安保智能辐射探测系统研制(HH21050101)。

Method discription and simulation verification of a coded aperture gamma camera with different vertical and horizontal fields of view

LI Yan, LIU Liye, CAO Qinjian, ZHAO Yuan, XIA Sanqiang, DONG Jiajie

China Institute of Radiation Protection,Taiyuan 030006

Received:2022-05-06 Online:2022-11-20 Published:2023-01-05

摘要/Abstract

摘要： 对基于M-M编码方式的编码孔径成像系统的方法进行了论述,通过蒙特卡罗软件MCNP对基于M-M编码方式的成像系统建立模型。使用不同能量的放射源在不同的位置,对不同厚度的编码准直器进行照射,并对所获得的重建图像SNR进行了分析与说明,确定了最佳的码板厚度为10 mm。随后模拟了基于最佳码板参数的成像系统对单点源、多点源以及形状源的响应,其中单点源的重建图像SNR达到40.36,成像系统也成功重建出了形状源的形状,且背景都没有波动的旁瓣。以上结果证明M-M编码方式优异的性能,具备替代MURA或者URA在特殊场景的应用潜力。可为后续的基于M-M编码方式的编码孔径伽玛相机的研制奠定基础。

关键词: M-M编码方式, 蒙特卡罗模拟, 伽玛相机, 伽玛射线探测, 视场

Abstract: The method of the imaging system based on the M-M coded method is discussed, and the model of the imaging system based on the M-M coding method is established through Monte Carlo software MCNP. Using radiation sources of different energies at different positions to irradiate coding collimators with different thicknesses, it is determined that the optimal thickness of the coded collimator is 10mm by analyzing and explaining the reconstructed image SNR obtained. Then the response of the imaging system based on the optimal parameters of coded mask to the single-point source, multi-point source and extended source was simulated. The reconstructed image SNR of the single-point source reached 40.36, and the imaging system also successfully reconstructed the shape of the extended source. There are no fluctuating sidelobes in the background of reconstructed images of point and extended source. The above results prove the excellent performance of the M-M coded method, and it has the potential to replace MURA or URA in special scenarios. This article can lay the foundation for the subsequent development of coded aperture gamma camera based on M-M coded method.

Key words: M-M coding mode, Monte Carlo simulation, gamma camera, gamma ray detection, field of view

中图分类号:

TL81

李岩, 刘立业, 曹勤剑, 赵原, 夏三强, 董佳杰. 一种纵、横向视野不同的编码孔径伽玛相机的方法论述与模拟验证[J]. 辐射防护, 2022, 42(6): 548-555.

LI Yan, LIU Liye, CAO Qinjian, ZHAO Yuan, XIA Sanqiang, DONG Jiajie. Method discription and simulation verification of a coded aperture gamma camera with different vertical and horizontal fields of view[J]. RADIATION PROTECTION, 2022, 42(6): 548-555.

参考文献

[1] Guo J, Pang X, Cai J, et al. Compact MPPC-based coded aperture imaging camera for dual-particle detection[J].Radiat Detect Technol Methods, 2021, 5(1):61-70.
[2] Gmar M, Agelou M, Carrel F, et al. GAMPIX: A new generation of gamma camera[J].Nuclear Instruments & Methods in Physics Research, 2011, 652(1):638-640.
[3] Sun S, Zhang Z, Shuai L, et al. Development of a panorama coded-aperture gamma camera for radiation detection[J].Radiation Measurements, 2015, 77(7):34-40.
[4] Caroli E, Stephen J B, Cocco G D, et al. Coded aperture imaging in X- and gamma-ray astronomy[J].Space Science Reviews, 1987, 45(3):349-403.
[5] Lee T, Kwak S W, Lee W, et al. Investigation of nuclear material using a compact modified uniformly redundant array gamma camera[J].Nuclear Engineering and Technology, 2018, 50(6):923-928.
[6] Fenimore E E, Cannon T M. Coded aperture imaging with uniformly redundant arrays[J].Applied Optics, 1978, 17(3):337-347.
[7] Gottesman S R, Fenimore E E.New family of binary arrays for coded aperture imaging[J].Applied Optics, 1989, 28(20):4344-4353.
[8] Liang X,Pang X,Cao D,et al. Self-supporting design of a time-encoded aperture, gamma-neutron imaging system[J].Nuclear Instruments & Methods in Physics Research, 2020,951:162964.1-162964.8.
[9] Byard K. On self-supporting coded aperture arrays[J].Nuclear Instruments & Methods in Physics Research, 1992, 322(1):97-100.
[10] Shen X L,Gong P,Tang X B, et al. Encoding methods matching the 16 × 16 pixel CZT detector of a coded aperture gamma camera[J]. Nuclear Techniques, 2020, 31(9):8.
[11] Gottesman S R, Schneid E J.PNP—A new class of coded aperture arrays[J].IEEE Transactions on Nuclear Science, 1986, 33(1):745-749.
[12] Lei S, Liang X, Zhang Z, et al. A novel square-hole based coded aperture imaging method[C].2016 IEEE Nuclear Science Symposium, Medical Imaging Conference and Room-Temperature Semiconductor Detector Workshop (NSS/MIC/RTSD). IEEE, 2016.
[13] Seiichi Yamamoto, Hiroshi Watabe, Yasukazu Kanai, et al. Development of an ultrahigh-resolution Si-PM-based dual-head GAGG coincidence imaging system[J].Nuclear Inst and Methods in Physics Research, A, 2013, 703(3):183-189.
[14] 刘毅, 帅磊, 张济鹏, 等.基于GAGG:Ce晶体耦合Si∶PM的位置灵敏探测器的设计与评估[J].原子能科学技术, 2018, 52(08):1487-1491.