Journal
JOURNAL OF SYNCHROTRON RADIATION
Volume 19, Issue -, Pages 210-215Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S0909049511052253
Keywords
X-ray fluorescence; computed tomography; ordered-subsets expectation maximization algorithm; angular sampling interval
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Funding
- National Basic Research Program of China [2010CB834301]
- Chinese Academy of Sciences [GJHZ09058]
- National Natural Science Foundation of China [10805071, 81071154]
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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.
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