ISSN 1004-4140
CN 11-3017/P
Volume 14 Issue 2
Jun.  2005
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LI Jian, WU Zhi-fang. Maximum a posteriori Reconstruction Algorithms in Emission CT[J]. CT Theory and Applications, 2005, 14(2): 10-15.
Citation: LI Jian, WU Zhi-fang. Maximum a posteriori Reconstruction Algorithms in Emission CT[J]. CT Theory and Applications, 2005, 14(2): 10-15.
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Maximum a posteriori Reconstruction Algorithms in Emission CT

  • Institute of Nuclear and New energy Technology, Tsinghua University, Beijing 100084

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  • Received Date: March 17, 2005
  • Available Online: December 28, 2022
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  • MLEM (Maximum Likelihood-Expectation Maximization) has been widely used in Emission CT, however, in practice two draw backs are encountered: 1) due to the ill-conditioned nature of the reconstruction problem, reconstructions tent to take on an increasing non-smooth quality as the ML solution is approached; 2) convergence can be increasingly slow as the ML solution is approached. Maximum a posteriori (MAP) reconstruction has been shown to have significant advantages over MLEM in terms of noise reduction and the convergence speed. A review of development of MAP algorithms is presented in this paper.
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