Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2020, Vol. 31 ›› Issue (9): 92 doi: 10.1007/s41365-020-00796-5

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles     Next Articles

Encoding methods matching the 16 × 16 pixel CZT detector of a coded aperture gamma camera

Xiao-Lei Shen1 • Pin Gong1 • Xiao-Bin Tang1,2 • Rui Zhang1 • Jin-Chao Ma   

  1. 1 Department of Nuclear Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
    2 Key Laboratory of Nuclear Technology Application and Radiation Protection in Astronautics (Nanjing University of Aeronautics and Astronautics), Ministry of Industry and Information Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
  • Received:2020-02-27 Revised:2020-06-30 Accepted:2020-07-03
  • Contact: Xiao-Bin Tang E-mail:tangxiaobin@nuaa.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (No. 11675078), the Primary Research and Development Plan of Jiangsu Province (No. BE2017729), and the Foundation of Graduate Innovation Center in NUAA (No. kfjj20190614).
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Xiao-Lei Shen, Pin Gong, Xiao-Bin Tang, Rui Zhang, Jin-Chao Ma. Encoding methods matching the 16 × 16 pixel CZT detector of a coded aperture gamma camera.Nuclear Science and Techniques, 2020, 31(9): 92     doi: 10.1007/s41365-020-00796-5
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Abstract: With the advancements in nuclear energy, methods that can accurately obtain the spatial information of radioactive sources have become essential for nuclear energy safety. Coded aperture imaging technology is widely used because it provides two-dimensional distribution information of radioactive sources. The coded array is a major component of a coded aperture gamma camera, and it affects the key performance parameters of the camera. Currently, commonly used coded arrays such as uniformly redundant arrays (URAs) and modified uniformly redundant arrays (MURAs) have prime numbers of rows or columns and may lead to wastage of detector pixels. A 16 9 16 coded array was designed on the basis of an existing 16 9 16 multi-pixel position-sensitive cadmium zinc telluride detector. The digital signal-to-noise (SNR) ratio of the point spread function at the center of the array is 25.67. Furthermore, Monte Carlo camera models and experimental devices based on rank-13 MURA and rank-16 URA have been constructed. With the same angular resolution, the field size of view under rank-16 URA is 1.53 times that of under rank-13 MURA. Simulations (Am-241, Co-57, Ir-192, Cs-137) and experiments (Co-57) are conducted to compare the imaging performance between rank-16 URA and rank-13 MURA. The contrast-to-noise ratio of the reconstructed image of the rank-16 array is great and only slightly lower than that of rank-13 MURA. However, as the photon energy increases, the gap becomes almost negligible.

Key words: Coded aperture imaging, CZT, Gamma camera, Uniformly redundant arrays