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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2605.11637 |
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| _version_ | 1866918525812080640 |
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| author | Shimomiya, Taiga Kusumi, Taichi Uesugi, Masayuki Takeuchi, Akihisa Sada, Yuki Shouno, Hayaru Okada, Masato |
| author_facet | Shimomiya, Taiga Kusumi, Taichi Uesugi, Masayuki Takeuchi, Akihisa Sada, Yuki Shouno, Hayaru Okada, Masato |
| contents | X-ray computed tomography (CT) reveals the materials' internal structures non-destructively from a tilt series of projected images. Filtered back projection (FBP) is a widely-adopted reconstruction algorithm in CT owing to its small computational cost. Under low-dose or sparse-view conditions, however, FBP often amplifies noise, severely degrading the reconstructed images. In this study, we evaluated the performance of a Bayesian CT reconstruction algorithm based on the Markov random field model under such adverse conditions. Through simulations, we demonstrated that the proposed algorithm shows higher reconstruction performance than FBP under both low-dose and sparse-view conditions. The hyperparameters are estimated by minimizing the Bayesian free energy, enabling adaptive reconstruction that reflects the noise characteristics of the observed projection data. These results suggest that the proposed algorithm can broaden the applicability of CT to dose-sensitive applications and time-constrained measurements, where only limited observed projection data are available. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_11637 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Computed Tomography Reconstruction Algorithm Using Markov Random Field Model Shimomiya, Taiga Kusumi, Taichi Uesugi, Masayuki Takeuchi, Akihisa Sada, Yuki Shouno, Hayaru Okada, Masato Medical Physics Disordered Systems and Neural Networks Data Analysis, Statistics and Probability X-ray computed tomography (CT) reveals the materials' internal structures non-destructively from a tilt series of projected images. Filtered back projection (FBP) is a widely-adopted reconstruction algorithm in CT owing to its small computational cost. Under low-dose or sparse-view conditions, however, FBP often amplifies noise, severely degrading the reconstructed images. In this study, we evaluated the performance of a Bayesian CT reconstruction algorithm based on the Markov random field model under such adverse conditions. Through simulations, we demonstrated that the proposed algorithm shows higher reconstruction performance than FBP under both low-dose and sparse-view conditions. The hyperparameters are estimated by minimizing the Bayesian free energy, enabling adaptive reconstruction that reflects the noise characteristics of the observed projection data. These results suggest that the proposed algorithm can broaden the applicability of CT to dose-sensitive applications and time-constrained measurements, where only limited observed projection data are available. |
| title | Computed Tomography Reconstruction Algorithm Using Markov Random Field Model |
| topic | Medical Physics Disordered Systems and Neural Networks Data Analysis, Statistics and Probability |
| url | https://arxiv.org/abs/2605.11637 |