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• W2216079786 abstract "Emission tomographic image reconstruction is an ill-posed problem due to limited and noisy data and various image-degrading effects affecting the data and leads to noisy reconstructions. Explicit regularization, through iterative reconstruction methods, is considered better to compensate for reconstruction-based noise. Local smoothing and edge-preserving regularization methods can reduce reconstruction-based noise. However, these methods produce overly smoothed images or blocky artefacts in the final image because they can only exploit local image properties. Recently, non-local regularization techniques have been introduced, to overcome these problems, by incorporating geometrical global continuity and connectivity present in the objective image. These techniques can overcome drawbacks of local regularization methods; however, they also have certain limitations, such as choice of the regularization function, neighbourhood size or calibration of several empirical parameters involved. This work compares different local and non-local regularization techniques used in emission tomographic imaging in general and emission computed tomography in specific for improved quality of the resultant images." @default.
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• W2216079786 date "2015-12-29" @default.
• W2216079786 modified "2023-09-25" @default.
• W2216079786 title "Local and Non-local Regularization Techniques in Emission (PET/SPECT) Tomographic Image Reconstruction Methods" @default.
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• W2216079786 doi "https://doi.org/10.1007/s10278-015-9853-x" @default.
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