Improved Cohen-Sutherland algorithm for TGS transmission imaging  

作　　者：Yu-Cheng Yan Ming-Zhe Liu Xing-Yu Li Yu-Ting Xiong Yao Tan Zhuo Zuo Lan Chang Cui Li 

机构地区：[1]State Key Laboratory of Geohazard Prevention and Geoenvironment Protection,Chengdu University of Technology,Chengdu,610059,China [2]The Engineering and Technical College of Chengdu University of Technology,Leshan,614000,China [3]Southwestern Institute of Physics,Chengdu,610225,China [4]Sichuan University of Science and Engineering,Zigong,643000,China

出　　处：《Nuclear Science and Techniques》2023年第6期91-102,共12页核技术（英文）

基　　金：supported by the National Natural Science Foundation of China(No.U19A2086);the fund of Science and Technology Bureau of LeShan City(No.22ZDYJ0015).

摘　　要：Tomographic gamma scanner(TGS),an advancedγ-ray nondestructive analysis technique,can locate and analyze nuclides in radioactive nuclear waste,and TGS can be categorized into two processes:e.g.,transmission measurement and emission measurement.Specifically,transmission measurements provide the basis for accurate measurement of nonuniform radionuclide content in TGS scanning.The scan data were obtained using the Monte Carlo tool Geant4 simulation,and 25 voxels were divided into five lengths and five widths in a square barrel.In this study,an encoding cropping algorithm based on draped foot vector judgment was adopted to rapidly calculate the voxel trace matrix within a square bucket of nuclear waste,and the transmission images were reconstructed using ordered subset expectation maximization.The results indicated that the cropping speed of the improved coding algorithm was significantly higher than that of the original algorithm,and the relative mean deviation and root-mean-square error between the reconstructed attenuation coefficient and the reference standard value tended to decrease with an increase in the cropped line segments in the voxel;the Pearson correlation coefficient tended to converge to 1.0.The image quality evaluation parameters of the high media-density materials were better than those of the low media-density materials in the above three indexes.The reconstruction effect was relatively poor for more complex filling materials.When there were more than 10 cropped line segments in the voxel,the reconstruction data generally tended to be stable.The graphical trimming algorithm can rapidly calculate the trace matrix of the scanned voxels;it exhibits the advantages of speed and efficiency and can serve as a novel method to solve the trace matrix of TGS nuclear waste transmission scans.

关 键 词：TGS Cohen-Sutherland Transmission scanning Trace matrix 

分 类 号：TL81[核科学技术—核技术及应用] TP391.41[自动化与计算机技术—计算机应用技术]