ISSN 1004-4140
CN 11-3017/P
LIU Chang, QIU Jun, XIAO Bo. An Symmetric Ordered Subset Expectation Maximization Accelerated Algorithm[J]. CT Theory and Applications, 2009, 18(4): 1-8.
Citation: LIU Chang, QIU Jun, XIAO Bo. An Symmetric Ordered Subset Expectation Maximization Accelerated Algorithm[J]. CT Theory and Applications, 2009, 18(4): 1-8.

An Symmetric Ordered Subset Expectation Maximization Accelerated Algorithm

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  • Received Date: September 14, 2009
  • Available Online: December 14, 2022
  • The ordered subsets EM algorithm has excited considerable interest for image reconstruction from projection due to its acceleration of the standard EM algorithm.In this paper,we introduce an update algorithm called Symmetric Ordered Subset Expectation Maximization Algorithm(S-OSEM)which accelerates the OSEM as well as satisfies subset balance and orders the subset effectively by the Symmetric structure of projection lines. Furthermore,standard EM also can be accelerated by the Symmetric structure of projection lines.The results indicate that with the appropriate number of subsets,the S-OSEM algorithm can improve the reconstruction speed and imaging precision effectively.
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