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| Simulation and analysis of an imaging detection device for wound contamination caused by transuranic nuclides |
| WANG Yujian, WANG Wei, LI Xinglong, WANG Chuangao, PANG Hongchao, CHEN Ling |
| China Institute of Atomic Energy, Beijing 102413 China |
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Abstract Objective To address the radioactive contamination of wounds caused by transuranic nuclides, wound radiation imaging based on coded aperture imaging technology was investigated. Methods By simulating multiple source terms using Monte Carlo method, the differences in imaging performance between two image reconstruction algorithms under near-field conditions were compared. The effects of detector pixels and detection plane pixels on image resolution were investigated. Results The imaging system was simulated based on the designed dimensions. The simulated imaging field of view was 89.4 mm×89.4 mm and the simulated angular resolution was 1.98°. Based on the comparison of the average width at half height of the reconstructed point sources under different conditions, it was found that increasing the number of pixels in the detector and detection plane optimized the angular resolution but significantly prolonged the Monte Carlo simulation time. Conclusion According to the simulation results, the parameters of the imaging system can be used to effectively image radioactive contamination. Our results provide methodological support for the measurement of wound contamination caused by transuranic nuclides, and lay the foundation for the development of wound contamination imaging detection systems in the future.
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Received: 27 December 2023
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[1] 吕晓凡, 卢丙慧, 冉新泽, 等. 核应急医学救援中放射性核素污染伤口的医学处理思考[J]. 中国辐射卫生，2023，32（4）：402-407,412.
Lyu XF, Lu BH, Ran XZ, et al. A reflection on medical treatment of radionuclide-contaminated wounds during medical response to nuclear emergencies[J]. Chin J Radiol Health, 2023, 32（4）: 402-407,412.
[2] 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.
[3] 李汉平, 王锋, 艾宪芸. 编码板成像系统MLEM算法优化[J]. 核技术，2017，40（2）：020404.
Li HP, Wang F, Ai XY. Algorithm optimization of MLEM in coded aperture imaging system[J]. Nucl Tech, 2017, 40（2）: 020404.
[4] Altomare C, Di Venere L, Fanchini E, et al. A gamma-ray imaging camera for ambient radioactivity detection[J]. Nucl Instrum Methods Phys Res Sect A: Accel, Spectrom, Detect Assoc Equip, 2020, 981: 164492.
[5] Hu YF, Fan P, Lyu ZL, et al. Design and performance evaluation of a 4π-view gamma camera with mosaic-patterned 3D position-sensitive scintillators[J]. Nucl Instrum Methods Phys Res Sect A: Accel, Spectrom, Detect Assoc Equip, 2022, 1023: 165971.
[6] Lee HS, Kim JH, Lee J, et al. Design and performance prediction of large-area hybrid gamma imaging system (LAHGIS) for localization of low-level radioactive material[J]. Nucl Eng Technol, 2021, 53（4）: 1259-1265.
[7] Lange K, Carson R. EM reconstruction algorithms for emission and transmission tomography[J]. J Comput Assist Tomogr, 1984, 8（2）: 306-316.
[8] Tain JL, Cano-Ott D. Algorithms for the analysis of β-decay total absorption spectra[J]. Nucl Instrum Methods Phys Res Sect A: Accel, Spectrom, Detect Assoc Equip, 2007, 571（3）: 728-738.
[9] Mu ZP, Liu YH. Aperture collimation correction and maximum-likelihood image reconstruction for near-field coded aperture imaging of single photon emission computerized tomography[J]. IEEE Trans Med Imaging, 2006, 25（6）: 701-711.
[10] Sun SF, Zhang ZM, Shuai L, et al. Development of a panorama coded-aperture gamma camera for radiation detection[J]. Radiat Meas, 2015, 77: 34-40.
[11] Byard K, Ramsden D. Coded aperture imaging using imperfect detector systems[J]. Nucl Instrum Methods Phys Res Sect A: Accel, Spectrom, Detect Assoc Equip, 1994, 342（2/3）: 600-608.
[12] Shen XL, Gong P, Tang XB, et al. Encoding methods matching the 16×16 pixel CZT detector of a coded aperture gamma camera[J]. Nucl Sci Tech, 2020, 31（9）: 92.
[13] 孙世杰. 编码孔成像算法研究[D]. 哈尔滨: 哈尔滨工程大学, 2019. DOI: 10.27060/d.cnki.ghbcu.2019.000699.
Sun SJ. Research on the coded aperture imaging algorithm[D]. Harbin: Harbin Engineering University, 2019. DOI: 10.27060/d.cnki.ghbcu.2019.000699.
[14] 刘崎. 编码孔径成像放射源定位关键技术研究[D]. 成都: 成都理工大学, 2021. DOI: 10.26986/d.cnki.gcdlc.2021.000040.
Liu Q. Research on key techniques of radioactive sources localization in coded-aperture imaging[D]. Chengdu: Chengdu University of Technology, 2021. DOI: 10.26986/d.cnki.gcdlc.2021.000040.
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