Open AccessFast and accurate X‐ray fluorescence computed tomography imaging with the ordered‐subsets expectation maximization algorithm
Author(s) -
Yang Qun,
Deng Biao,
Lv Weiwei,
Shen Fei,
Chen Rongchang,
Wang Yudan,
Du Guohao,
Yan Fuhua,
Xiao Tiqiao,
Xu Hongjie
Publication year - 2012
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s0909049511052253
Subject(s) - expectation–maximization algorithm , imaging phantom , sampling (signal processing) , algorithm , projection (relational algebra) , image quality , range (aeronautics) , iterative reconstruction , computer science , tomography , image (mathematics) , maximization , artificial intelligence , computer vision , mathematics , physics , maximum likelihood , optics , mathematical optimization , statistics , materials science , filter (signal processing) , composite material
The ordered‐subsets expectation maximization algorithm (OSEM) is introduced to X‐ray fluorescence computed tomography (XFCT) and studied; here, simulations and experimental results are presented. The simulation results indicate that OSEM is more accurate than the filtered back‐projection algorithm, and it can efficiently suppress the deterioration of image quality within a large range of angular sampling intervals. Experimental results of both an artificial phantom and cirrhotic liver show that with a satisfying image quality the angular sampling interval could be improved to save on the data‐acquisition time when OSEM is employed. In addition, with an optimum number of subsets, the image reconstruction time of OSEM could be reduced to about half of the time required for one subset. Accordingly, it can be concluded that OSEM is a potential method for fast and accurate XFCT imaging.