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• W1963933039 abstract "Accurate and robust reconstruction of the radioactivity concentration is of great importance in positron emission tomography (PET) imaging. Given the Poisson nature of photo-counting measurements, we present a reconstruction framework that integrates sparsity penalty on a dictionary into a maximum likelihood estimator. Patch-sparsity on a dictionary provides the regularization for our effort, and iterative procedures are used to solve the maximum likelihood function formulated on Poisson statistics. Specifically, in our formulation, a dictionary could be trained on CT images, to provide intrinsic anatomical structures for the reconstructed images, or adaptively learned from the noisy measurements of PET. Accuracy of the strategy with very promising application results from Monte-Carlo simulations, and real data are demonstrated." @default.
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• W1963933039 date "2015-01-07" @default.
• W1963933039 modified "2023-10-11" @default.
• W1963933039 title "Sparse representation and dictionary learning penalized image reconstruction for positron emission tomography" @default.
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• W1963933039 doi "https://doi.org/10.1088/0031-9155/60/2/807" @default.
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