γ射线能量、码板与探测器厚度对编码成像视野范围的影响研究

Abstract

Abstract: In coded aperture imaging systems, the field of view (FOV) is conventionally determined by the geometric relationship between the coded aperture mask and the position-sensitive detector. However, the influence mechanism of critical physical parameters—including the thickness and material properties of both the mask and detector, as well as the radiation energy—on the fully coded field of view (FCFOV) has not been systematically investigated. This study employs a controlled-variable approach to systematically elucidate the relationship among these parameters (mask thickness/material, detector thickness/material, and energy) and the FCFOV. By introducing the concept of equivalent thickness to revise the conventional geometric model (which relies solely on mask-detector distance), we propose an empirical parameterized formula for FCFOV calculation, representing the first such model of its kind internationally. Both simulations and experimental results validate the effectiveness of the formula, demonstrating its superior accuracy in defining the FCFOV boundaries compared to traditional methods. These research findings provide a important reference for future FOV calibration and system design in coded aperture imaging applications.

Key words: coded imaging FOV, mask thickness, detector thickness, monte carlo simulation, coded aperture

CLC Number:

TL81

WANG Yilin, LIANG Xiuzuo, LIU Xinmeng, YU Xiaodong, GAO Ge, YANG Yao, SHUAI Lei. Investigation of the effects of gamma-ray energy, coded aperture mask and detector thickness on the fully coded field of view[J].RADIATION PROTECTION, 2025, 45(6): 576-585.

References

[1] 李岩, 刘立业, 曹勤剑, 等. 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, et al. 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.
[2] LIU Qi, CHENG Yi, TUO Xianguo, et al. Neural network method for localization of radioactive sources within a partially coded field-of-view in coded-aperture imaging[J]. Applied Radiation and Isotopes, 2021, 170: 109637.
[3] Jeong M, Kim G. MCNP-polimi simulation for the compressed-sensing based reconstruction in a coded-aperture imaging CAI extended to partially-coded field-of-view[J]. Nuclear Engineering and Technology, 2021, 53(1): 199-207.
[4] Altomare C, Di Venere L, Pantaleo F R, et al. A high efficiency fast-response gamma detector with mrad pointing capabilities[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2022, 1025: 166106.
[5] WANG Zeyu, WANG Chao, GONG Pin, et al. Coded-aperture imaging based on random code and backpropagation neural network[J]. Annals of Nuclear Energy, 2024, 195: 110183.
[6] Kaissas I, Paradimitropoulos C, Karafasoulis K, et al. 3-D localization of gamma ray sources with coded apertures for medical applications[J]. Journal of Physics: Conference Series, 2015, 637(1): 012016.
[7] Fenimore E E, Cannon T M. Coded aperture imaging with uniformly redundant arrays[J]. Applied Optics, 1978, 17(3): 337-347.
[8] 李海俊, 邹士亚, 郝立亮. γ编码孔相机系统设计分析[C]//中国核学会2009年学术年会论文集. 北京: 原子能出版社, 2009: 3676-3681.
[9] Accorsi R. Design of a near-field coded aperture cameras for high-resolution medical and industrial gamma-ray imaging[D]. Cambridge: Massachusetts Institute of Technology, 2001.
[10] Dean A J. Imaging in high-energy astronomy[C]//Heavy scintillators: For scientific and industrial applications. Proceedings, ‘Crystal 2000’ International Workshop. Chamonix: [s.n], 1992: 53-64.
[11] Caroli E, Stephen J B, Di Cocco G, et al. Coded aperture imaging in X- and gamma-ray astronomy[J]. Space Science Reviews, 1987, 45(3): 349-403.
[12] Braga J. Coded aperture imaging in high-energy astrophysics[J]. Publications of the Astronomical Society of the Pacific, 2020, 132: 012001.
[13] Groeneveld H A. Design,simulation und optimierung kodierter aperturen[D]. Tübingen: Eberhard-Karls-Universit, 1999.
[14] Michalik D. Image reconstruction software for near-field coded mask instruments[D]. Erlangen-Nuremberg: University of Erlangen-Nuremberg, 2009.
[15] Agostinelli S, Allison J, Amako K, et al. Geant4—A simulation toolkit[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2003, 506(3): 250-303.
[16] Allison J, Amako K, Apostolakis J, et al. Geant4 developments and applications[J]. IEEE Transactions on Nuclear Science, 2006, 53(1): 270-278.
[17] Allison J, Amako K, Apostolakis J, et al. Recent developments in Geant4[J]. Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2016, 835: 186-225.
[18] 昂文胜, 董顺成, 杜永欢, 等. 编码孔径辐射成像定位技术[J]. 辐射研究与辐射工艺学报, 2024, 42(2): 20801.ANG Wensheng, DONG Shuncheng, DU Yonghuan, et al. Positioning technique of coded aperture radiation imaging[J]. Journal of Radiation Research and Radiation Processing, 2024, 42(2): 20801.
[19] 刘鑫垚, 魏清阳, 许天鹏, 等. 基于SPECT探头的高灵敏编码孔径γ成像系统[J]. 核技术, 2022, 45(12): 120401.
LIU Xinyao, WEI Qingyang, XU Tianpeng, et al. Highly sensitive coded aperture gamma imaging system based on a SPECT probe[J]. Nuclear Techniques, 2022, 45(12): 120401.
[20] 赵翠兰, 陈立宏, 李勇平. MURA编码辐射成像系统的解码方法[J]. 核技术, 2014, 37(8): 30-36.
ZHAO Cuilan, CHEN Lihong, LI Yongping. Decoding process of a radiation imaging system using MURA coded aperture collimator[J]. Nuclear Techniques, 2014, 37(8): 080401.

Investigation of the effects of gamma-ray energy, coded aperture mask and detector thickness on the fully coded field of view

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