Study of image reconstruction using dynamic grids in tomographic gamma scanning

Study of image reconstruction using dynamic grids in tomographic gamma scanning 1 first-author 1 corresp Corresponding author. E-mail address: guweiguo@sjtu.edu.cn Corresponding author. E-mail address: guweiguo@sjtu.edu.cn guweiguo@sjtu.edu.cn 1 1 School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China In this paper, a new image reconstruction algorithm employing dynamic grids technique is proposed for tomographic gamma scanning. The key feature of the algorithm is the use of adaptive grid refinement in areas that indicate large values. Simulation results show that the application of dynamic grids has a good performance in emission reconstruction with a distinct advantage in the accurate positioning of the 'hot spots' and reducing the number of grids, but doesn't achieve a tangible improvement in transmission reconstruction. Tomographic gamma scanning Emission reconstruction Transmission reconstruction Dynamic grids References Reily D , Ensslin N , Smith H , et al . Passive Nondestructive Assay of Nuclear Materials , Los Alamos National Laboratory , 1991 , 218 - 234 . Passive Nondestructive Assay of Nuclear Materials Becker G , Mcllwain M and Connoly M . Transuranic and Low-Level Boxed Waste Form Nondestructive Assay Technology Overview and Assessment , Idaho National Engineering and Environmental Laboratory , 1999 , 76 - 89 . Transuranic and Low-Level Boxed Waste Form Nondestructive Assay Technology Overview and Assessment Estep R J . Trans Am Nucl Soc , 1990 , 62 : 178 - 178 . Trans Am Nucl Soc Kawasaki S , Kondo M , Lzumi S , et al . Appl Radiat Isot , 1990 , 41 : 983 - 987 . Appl Radiat Isot Estep R J , Prettyman T H , Sheppard G A . Nucl Sci Eng , 1994 , 118 : 145 - 152 . Nucl Sci Eng Venkataraman R , Croft S , Villani M , et al . The next generation tomographic gamma scanner , Annual Symposium on Safeguards and Nuclear Material Management , London, UK , May 10-12, 2005 . The next generation tomographic gamma scanner Venkataraman R , Villani M , Croft S , et al . Nucl Instrum Meth Phys Res A , 2007 , 579 : 375 - 379 . Nucl Instrum Meth Phys Res A Wang T F , Martz H E , Roberson G P , et al . Nucl Instrum Meth Phys Res A , 1994 , 353 : 672 - 67 . Nucl Instrum Meth Phys Res A Camp D C , Martz H E , Roberson G P , et al . Nucl Instrum Meth Phys Res A , 2002 , 495 : 69 - 83 . Nucl Instrum Meth Phys Res A Zhang Q H , HUI W H , WANG D , et al . Nucl Sci Tech , 2010 , 21 : 177 - 181 . Nucl Sci Tech Shepp L A , Vardi Y . IEEE Trans Med Imag , 1982 , MI-1 : 113 - 122 . IEEE Trans Med Imag 10.13538/j.1001-8042/nst.23.277-283 Supported by National Natural Science Foundation of China (No. 51106095, 11175118) and China Postdoctoral Science Foundation (No.20110490717) 2012-07-03 2012-10-20 2021-01-19 2012 Nuclear Science and Techniques 05 23