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Two major scientific research equipment development projects of the Chinese Academy of Sciences passed the acceptance. Recently, the Academy of Planning and Finance of the Chinese Academy of Sciences organized experts to carry out the major scientific research equipment development projects of the Institute of High Energy Physics, "γ-ray imaging system based on aperture coding technology" and "small SPECT / CT system. "Development" conducted on-site acceptance. The acceptance expert group listened to Wei Long, the project leader of the “γ-ray Imaging System Based on Aperture Coding Technologyâ€, and Wang Baoyi, the project leader of the “Small SPECT / CT System Development†project, and the use of the report, financial report, and test by the test expert group. In the report, the operation of the research and development equipment was checked on site, and the relevant documents and financial accounts were reviewed. The expert group made a high evaluation of the development of the two projects, and believed that the technical indicators met or exceeded the requirements stipulated in the implementation plan, the system reached the advanced level of similar international equipment, the technical files were complete, the funds were used reasonably, and the unit self-raised funds were in place. Unanimously agreed to pass the acceptance. The γ-ray imaging system based on aperture coding technology has a large viewing angle and high-efficiency γ-ray imaging and optical imaging fusion function. The nested coded aperture method and iterative decoding and reconstruction algorithm are used to effectively achieve noise suppression and strong γ-ray background. Weak source imaging. The position registration algorithm for the ray image and the optical image under different object distance conditions is designed to realize the fusion of the two images. The positioning of radioactive materials at different distances can be achieved. It plays an important role in finding lost radioactive sources, identifying radioactively contaminated areas, and nuclear emergency monitoring. It has important application prospects in the fields of environmental protection, nuclear energy and nuclear technology applications, and nuclear anti-terrorism. The small SPECT / CT system is equipped with SPECT (single photon emission tomography), μCT (micro-CT), and image fusion functions of the two, which solves the problem of multi-detector measurement of "dead zone" in the small animal SPECT / CT imaging system, and achieves a large Area, high-resolution position sensitive detection imaging technology. Realized and solved SPECT and CT image reconstruction algorithms and image fusion engineering. It has high-resolution imaging capabilities for bones and organs of small animals such as rats and mice, and provides technical means and research platforms for scientific research in nuclear medicine, pharmacology, biology and other related fields. The research results will provide technical support for the development and clinical application of localized SPECT / CT.