Diffusion Posterior Sampling for Synergistic Reconstruction in Spectral Computed Tomography

• Published in: 2024 IEEE International Symposium on Biomedical Imaging (ISBI) pp. 1 - 5
• Main Authors: Vazia, Corentin, Bousse, Alexandre, Vedel, Beatrice, Vermet, Franck, Wang, Zhihan, Dassow, Thore, Tasu, Jean-Pierre, Visvikis, Dimitris, Froment, Jacques
• Format: Conference Proceeding
• Language: English
• Published: IEEE 27.05.2024
• Subjects: Computational modeling; Computed tomography; Diffusion models; Generative AI; Inverse problems; Neural networks; spectral CT; synergistic reconstruction; Training; Training data
• ISSN: 1945-8452
• DOI: 10.1109/ISBI56570.2024.10635735

Using recent advances in generative artificial intelligence (AI) brought by diffusion models, this paper introduces a new synergistic method for spectral computed tomography (CT) reconstruction. Diffusion models define a neural network to approximate the gradient of the log-density of the training data, which is then used to generate new images similar to the training ones. Following the inverse problem paradigm, we propose to adapt this generative process to synergistically reconstruct multiple images at different energy bins from multiple measurements. The experiments suggest that using multiple energy bins simultaneously improves the reconstruction by inverse diffusion and outperforms state-of-the-art synergistic reconstruction techniques.