Research on location method of radiation action based on Si-PM array
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摘要: 在辐射成像中准确估计射线与探测器相互作用的空间位置是保障成像质量的关键步骤。为进一步提升辐射作用事件的定位效果，有效抑制重心法在辐射事件作用位置靠近探测器边缘时造成的定位偏移，针对Si-PM阵列构成的位置灵敏探测系统建立了基于响应函数的定位算法。搭建了基于CsI阵列与Si-PM阵列构成的位置灵敏探测器和基于ASIC的电子学读出系统，使用等效电阻网络简化了Si-PM阵列的输出信号数量， 通过实验获得了辐射事件在Si-PM阵列上的响应函数。实验结果表明，在同一条件下使用响应函数法在最边缘像素散点的FWHM仅为使用重心法获得FWHM的46.2%，与中央像素散点的FWHM相当，基于响应函数的辐射事件方法定位效果明显优于传统重心法的定位效果，可有效克服重心法的边缘效应。Abstract: Accurately estimating the spatial position of the interaction between the ray and the detector in radiation imaging is a key step to ensure the imaging quality. To further improve the position effect of radiation events and effectively suppress the position shift caused by the center of gravity method when radiation events are close to the edge of the detector, a response function-based position algorithm is established for the position -sensitive detection system composed of Si-PM arrays. A position-sensitive detector based on CsI array and Si-PM array and an ASIC-based electronic readout system were built, and the equivalent resistance network was used to simplify the number of output signals of Si-PM array, then the response functions of radiation events on Si-PM arrays were obtained experimentally. The experimental results show that under the same conditions, the FWHM of the scatter points of the most edge pixels using the response function method is only 46.2% of the FWHM obtained by using the center of gravity method, which is comparable to the FWHM of the scatter points of the central pixels, the localization effect of the radiation event method based on the response function is obviously better than that of the traditional center of gravity method, which can effectively overcome the edge effect of the center of gravity method.
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Key words:
- radiography /
- position sensitive detector /
- Si-PM /
- center of gravity method
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图 7 辐射事件发生在探测器不同位置时重心法与响应函数法的定位情况
Figure 7. Positioning situation of the center of gravity method and the response function method when the radiation event occurs at different positions of the detector
图 9 响应函数法与重心法的结果对比
Figure 9. Comparison of results between response function method and center of gravity method
图 10 中央像素处响应函数法与重心法的散点图的FWHM对比
Figure 10. FWHM comparison of the response function method and the center-of-gravity method of the scatter plot at the central pixel
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[1] Hu Yifan, Fan Peng, Lyu Zhenlei, et al. Design and performance evaluation of a 4π-view gamma camera with mosaic-patterned 3D position-sensitive scintillators[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2022, 1023: 165971. doi: 10.1016/j.nima.2021.165971 [2] 周伟, 方方, 周建斌, 等. 辐射成像技术的初步应用研究[J]. 核电子学与探测技术, 2011, 31(2):235-238. (Zhou Wei, Fang Fang, Zhou Jianbin, et al. Preliminary research of radiography technique[J]. Nuclear Electronics & Detection Technology, 2011, 31(2): 235-238 doi: 10.3969/j.issn.0258-0934.2011.02.026 [3] Wen Jiaxing, Zheng Xutao, Gao Huaizhong, et al. Optimization of Timepix3-based conventional Compton camera using electron track algorithm[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2021, 1021: 165954. [4] 王利民, 邬海峰, 蔡庆胜. 数字式X射线辐射扫描成像系统及其应用[J]. 物理, 1999, 28(4):222-226. (Wang Limin, Wu Haifeng, Cai Qingsheng. X-ray digital radiography and its applications[J]. Physics, 1999, 28(4): 222-226 doi: 10.3321/j.issn:0379-4148.1999.04.008 [5] 许祖润. X和γ射线成像阵列探测器——基本问题、发展和前瞻[J]. 核电子学与探测技术, 2000, 20(1):62-65. (Xu Zurun. The imaging detector arrays for X and γ rays[J]. Nuclear Electronics & Detection Technology, 2000, 20(1): 62-65 doi: 10.3969/j.issn.0258-0934.2000.01.017 [6] 武传鹏, 李亮. 康普顿相机成像技术进展[J]. 核技术, 2021, 44(5):43-54. (Wu Chuanpeng, Li Liang. Review of Compton camera imaging technology development[J]. Nuclear Techniques, 2021, 44(5): 43-54 [7] 牛德芳. 基于位置灵敏探测器的电子学系统的研制[D]. 兰州: 西北师范大学, 2020Niu Defang. Development of electronic system based on position sensitive detector[D]. Lanzhou: Northwest Normal University, 2020 [8] 陈陶, 李智焕, 叶沿林, 等. 二维位置灵敏硅探测器的应用研究[J]. 高能物理与核物理, 2003, 27(1):72-75. (Chen Tao, Li Zhihuan, Ye Yanlin, et al. Study of two-dimensional position sensitive silicon detector[J]. High Energy Physics and Nuclear Physics, 2003, 27(1): 72-75 doi: 10.3321/j.issn:0254-3052.2003.01.020 [9] 王英杰. 基于硅光电倍增管的位置灵敏探测器技术研究[D]. 北京: 中国科学院大学, 2013Wang Yingjie. Study of position sensitive detector technologies based on silicon photomultipliers[D]. Beijing: University of Chinese Academy of Sciences, 2013 [10] Thanasas D, Georgiou E, Giokaris N, et al. A correction method of the spatial distortion in planar images from γ-Camera systems[J]. Journal of Instrumentation, 2009, 4: P06012. [11] 王薇, 李传龙, 吴建华, 等. 康普顿成像系统角分辨影响因素的理论及模拟研究[J]. 原子能科学技术, 2019, 53(12):2471-2477. (Wang Wei, Li Chuanlong, Wu Jianhua, et al. Theoretical and simulation study on factor affecting angular resolution of Compton imaging system[J]. Atomic Energy Science and Technology, 2019, 53(12): 2471-2477 doi: 10.7538/yzk.2018.youxian.0905 [12] van der Meulen N P, Strobel K, Lima T V M. New radionuclides and technological advances in SPECT and PET scanners[J]. Cancers, 1800, 13: 6183. [13] Lisi E, Colonna N. Position reconstruction in two-dimensional position-sensitive silicon detectors: a new analytical method[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1994, 348(2/3): 703-706. [14] 谭继廉, 靳根民, 段利敏, 等. 硅多条两维位置灵敏探测器的研制[J]. 核电子学与探测技术, 2006, 26(6):703-705. (Tan Jilian, Jin Genmin, Duan Limin, et al. Development of Si multi-strip Bi-dimension position sensitive detectors[J]. Nuclear Electronics & Detection Technology, 2006, 26(6): 703-705 doi: 10.3969/j.issn.0258-0934.2006.06.001 [15] Zhang Jipeng, Liang Xiuzuo, Cai Jiale, et al. Prototype of an array SiPM-based scintillator Compton camera for radioactive materials detection[J]. Radiation Detection Technology and Methods, 2019, 3: 17. doi: 10.1007/s41605-019-0095-1 [16] Mikeli M, Polychronopoulou A, Gektin A, et al. A new position reconstruction method for position sensitive photomultipliers[C]//Proceedings of 2008 IEEE Nuclear Science Symposium Conference Record. 2008. [17] Behera A, Acerbi F, Gola A, et al. Performance of a 6×6 mm2 SiPM module for time-domain diffuse optics[J]. IEEE Journal of Selected Topics in Quantum Electronics, 2022, 28: 3802910. [18] Duan Heying, Baratto L, Hatami N, et al. 68Ga-PSMA11 PET/CT for biochemically recurrent prostate cancer: Influence of dual-time and PMT-vs SiPM-based detectors[J]. Translational Oncology, 1800, 15: 101293. [19] Ma Cong, Dong Xue, Yu Li, et al. Design and evaluation of an FPGA-ADC prototype for the PET detector based on LYSO crystals and SiPM arrays[J]. IEEE Transactions on Radiation and Plasma Medical Sciences, 2022, 6(1): 33-41. doi: 10.1109/TRPMS.2021.3062362 [20] Lerche C W, Benlloch J M, Sanchez F, et al. Depth of λ-ray interaction within continuous crystals from the width of its scintillation light-distribution[J]. IEEE Transactions on Nuclear Science, 2005, 52(3): 560-572. doi: 10.1109/TNS.2005.851424 [21] Lerche C W, Benlloch J M, Sánchez F, et al. Depth of interaction detection with enhanced position-sensitive proportional resistor network[J]. Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2005, 537(1/2): 326-330. [22] Lee S J, Chung Y H, An S J. Monte Carlo modeling of a novel depth-encoding PET detector with DETECT2000[J]. Journal of the Korean Physical Society, 2016, 69(8): 1356-1361. doi: 10.3938/jkps.69.1356 -
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