PMID- 16274838
OWN - NLM
STAT- MEDLINE
DCOM- 20060201
LR  - 20191210
IS  - 0169-2607 (Print)
IS  - 0169-2607 (Linking)
VI  - 80
IP  - 3
DP  - 2005 Dec
TI  - A modified OSEM algorithm for PET reconstruction using wavelet processing.
PG  - 236-45
AB  - Ordered subset expectation-maximization (OSEM) method in positron emission 
      tomography (PET) has been very popular recently. It is an iterative algorithm and 
      provides images with superior noise characteristics compared to conventional 
      filtered backprojection (FBP) algorithms. Due to the lack of smoothness in images 
      in OSEM iterations, however, some type of inter-smoothing is required. For this 
      purpose, the smoothing based on the convolution with the Gaussian kernel has been 
      used in clinical PET practices. In this paper, we incorporated a robust wavelet 
      de-noising method into OSEM iterations as an inter-smoothing tool. The proposed 
      wavelet method is based on a hybrid use of the standard wavelet shrinkage and the 
      robust wavelet shrinkage to have edge preserving and robust de-noising 
      simultaneously. The performances of the proposed method were compared with those 
      of the smoothing methods based on the convolution with Gaussian kernel using 
      software phantoms, physical phantoms, and human PET studies. The results 
      demonstrated that the proposed wavelet method provided better spatial resolution 
      characteristic than the smoothing methods based on the Gaussian convolution, 
      while having comparable performance in noise removal.
FAU - Lee, Nam-Yong
AU  - Lee NY
AD  - School of Computer Aided Science, Inje University, Korea.
FAU - Choi, Yong
AU  - Choi Y
LA  - eng
PT  - Evaluation Study
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20051107
PL  - Ireland
TA  - Comput Methods Programs Biomed
JT  - Computer methods and programs in biomedicine
JID - 8506513
SB  - IM
MH  - *Algorithms
MH  - *Artifacts
MH  - Image Enhancement/*methods
MH  - Image Interpretation, Computer-Assisted/*methods
MH  - Likelihood Functions
MH  - Models, Biological
MH  - Models, Statistical
MH  - Positron-Emission Tomography/*methods
MH  - Reproducibility of Results
MH  - Sensitivity and Specificity
MH  - Signal Processing, Computer-Assisted
EDAT- 2005/11/09 09:00
MHDA- 2006/02/02 09:00
CRDT- 2005/11/09 09:00
PHST- 2004/04/22 00:00 [received]
PHST- 2005/08/26 00:00 [revised]
PHST- 2005/09/23 00:00 [accepted]
PHST- 2005/11/09 09:00 [pubmed]
PHST- 2006/02/02 09:00 [medline]
PHST- 2005/11/09 09:00 [entrez]
AID - S0169-2607(05)00193-8 [pii]
AID - 10.1016/j.cmpb.2005.09.004 [doi]
PST - ppublish
SO  - Comput Methods Programs Biomed. 2005 Dec;80(3):236-45. doi: 
      10.1016/j.cmpb.2005.09.004. Epub 2005 Nov 7.