|Table of Contents|

[1] Zhu Hongqing, Shu Huazhong, Zhou Jian, Luo Limin, et al. Application of SAGE algorithm in PET image reconstructionusing modified ordered subsets [J]. Journal of Southeast University (English Edition), 2005, 21 (3): 319-323. [doi:10.3969/j.issn.1003-7985.2005.03.015]
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Application of SAGE algorithm in PET image reconstructionusing modified ordered subsets()
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
21
Issue:
2005 3
Page:
319-323
Research Field:
Biological Science and Medical Engineering
Publishing date:
2005-09-30

Info

Title:
Application of SAGE algorithm in PET image reconstructionusing modified ordered subsets
Author(s):
Zhu Hongqing Shu Huazhong Zhou Jian Luo Limin
Department of Biological Science and Medical Engineering, Southeast University, Nanjing 210096, China
Keywords:
positron emission tomography space-alternating generalized expectation-maximization image reconstruction modified ordered subsets
PACS:
R817
DOI:
10.3969/j.issn.1003-7985.2005.03.015
Abstract:
A new method that uses a modified ordered subsets(MOS)algorithm to improve the convergence rate of space-alternating generalized expectation-maximization(SAGE)algorithm for positron emission tomography(PET)image reconstruction is proposed.In the MOS-SAGE algorithm, the number of projections and the access order of the subsets are modified in order to improve the quality of the reconstructed images and accelerate the convergence speed.The number of projections in a subset increases as follows:2, 4, 8, 16, 32 and 64.This sequence means that the high frequency component is recovered first and the low frequency component is recovered in the succeeding iteration steps.In addition, the neighboring subsets are separated as much as possible so that the correlation of projections can be decreased and the convergences can be speeded up.The application of the proposed method to simulated and real images shows that the MOS-SAGE algorithm has better performance than the SAGE algorithm and the OSEM algorithm in convergence and image quality.

References:

[1] Schmidlin P, Bellemann M E, Brix G.Iterative reconstruction of PET images using high-overrelaxation single-projection algorithm [J].Phys Med Biol, 1997, 42:569-582.
[2] Hudson H M, Larkin R S.Accelerated image reconstruction using ordered subsets of projection data [J].IEEE Trans Med Imag, 1994, 13(4):601-609.
[3] Lange K, Carson R.EM reconstruction algorithm for emission and transmission tomography [J].J Comp Assisted Tomography, 1994, 8(2):306-316.
[4] Fessler J A, Hero A O.Space-alternating generalized expectation-maximization algorithm [J].IEEE Trans on Signal Processing, 1994, 42(10):2664-2676.
[5] Fessler J A, Hero A O.New complete-data spaces and faster algorithms for penalized-likelihood emission tomography [A].In:IEEE Conference on Nuclear Science Symposium and Medical Imaging Conference[C].Virginia, 1994.1897-1901.
[6] Fessler J A, Hero A O.Complete-data spaces and generalized EM algorithms [A].In:IEEE International Conference on Acoustics, Speech, and Signal Processing [C].Minneapolis, USA, 1993.1-4.
[7] Takahash M, Ogawa K.Selection of projection set and the order of calculation in ordered subsets expectation maximization method [A].In:IEEE Conference on Nuclear Science Symposium and Medical Imaging[C].Toronto, Canada, 1998.1408-1412.
[8] Guan H, Gordon R A.Projection access order for speedy convergence of ART(algebraic reconstruction technique):a multilevel scheme for computed tomography [J].Phys Med Biol, 1993, 39:2005-2020.
[9] Ogawa K, Urabe H.Image quality in the modified ordered subset-Bayesian reconstruction [A].In:IEEE International Conference of Nuclear Science Symposium [C].Lyon, France, 2000.874-878.
[10] Urabe H, Ogawa K.Introduction of ordered subsets algorithm to maximum a posteriori expectation maximization method [A].In:IEEE International Conference on Image Processing [C].Chicago, USA, 1998, 3: 394-398.

Memo

Memo:
Biographies: Zhu Hongqing(1967—), female, doctor, hqzhu@sjtu.edu.cn;Shu Huazhong(corresponding author), male, professor, shu.list@seu.edu.cn.
Last Update: 2005-09-20