Ordered-subsets Multi-diffusion Model for Sparse-view CT Reconstruction

TL;DR

The paper introduces the ordered-subsets multi-diffusion model (OSMM) for sparse-view CT reconstruction, which improves image quality and detail preservation by dividing data into subsets and integrating global constraints.

Contribution

The novel OSMM approach divides projection data into subsets and combines local multi-subset diffusion with a global diffusion model, enhancing reconstruction accuracy and robustness.

Findings

OSMM outperforms traditional models in image quality.

OSMM demonstrates improved noise resilience.

The method adapts well to different sparsity levels.

Abstract

Score-based diffusion models have shown significant promise in the field of sparse-view CT reconstruction. However, the projection dataset is large and riddled with redundancy. Consequently, applying the diffusion model to unprocessed data results in lower learning effectiveness and higher learning difficulty, frequently leading to reconstructed images that lack fine details. To address these issues, we propose the ordered-subsets multi-diffusion model (OSMM) for sparse-view CT reconstruction. The OSMM innovatively divides the CT projection data into equal subsets and employs multi-subsets diffusion model (MSDM) to learn from each subset independently. This targeted learning approach reduces complexity and enhances the reconstruction of fine details. Furthermore, the integration of one-whole diffusion model (OWDM) with complete sinogram data acts as a global information constraint, which can reduce the possibility of generating erroneous or inconsistent sinogram information. Moreover, the OSMM's unsupervised learning framework provides strong robustness and generalizability, adapting seamlessly to varying sparsity levels of CT sinograms. This ensures consistent and reliable performance across different clinical scenarios. Experimental results demonstrate that OSMM outperforms traditional diffusion models in terms of image quality and noise resilience, offering a powerful and versatile solution for advanced CT imaging in sparse-view scenarios.