Proximal Neural Networks based reconstruction for few-view CT applications
This paper addresses the challenge of tomographic reconstruction from a limited number of views by using learning-based approaches. Recent advancements in Plug-and-Play (PnP) algorithms have shown promise for solving imaging inverse problems by utilizing the capabilities of Gaussian denoising algor...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | deu |
| Published: |
NDT.net
2025-02-01
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| Series: | e-Journal of Nondestructive Testing |
| Online Access: | https://www.ndt.net/search/docs.php3?id=30770 |
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| Summary: | This paper addresses the challenge of tomographic reconstruction from a limited number of views by using learning-based approaches. Recent advancements in Plug-and-Play (PnP) algorithms have shown promise for solving imaging inverse problems by utilizing the capabilities of Gaussian denoising algorithms to handle complex optimization tasks. Traditional denoising hand-crafted methods produce images with predictable features but require intricate parameter tuning and suffer from slow convergence. In contrast, learning-based models offer faster performance and higher reconstruction quality, although they lack interpretability. In this work, we propose training proximal neural networks (PNNs) to eliminate arbitrary artifacts and improve the performances of PnP algorithms. These networks are obtained by unrolling a proximal algorithm designed to find a maximum a posteriori (MAP) estimate, but within a fixed number of iterations, using learned linear operators. PNNs, grounded in optimization theory, offer flexibility and can be adapted to any image restoration task solvable by a proximal algorithm. Additionally, they feature much simpler architectures compared to traditional neural networks.
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| ISSN: | 1435-4934 |