Title
Deep Sinogram Completion With Image Prior for Metal Artifact Reduction in CT Images
Abstract
Computed tomography (CT) has been widely used for medical diagnosis, assessment, and therapy planning and guidance. In reality, CT images may be affected adversely in the presence of metallic objects, which could lead to severe metal artifacts and influence clinical diagnosis or dose calculation in radiation therapy. In this article, we propose a generalizable framework for metal artifact reduction (MAR) by simultaneously leveraging the advantages of image domain and sinogram domain-based MAR techniques. We formulate our framework as a sinogram completion problem and train a neural network (SinoNet) to restore the metal-affected projections. To improve the continuity of the completed projections at the boundary of metal trace and thus alleviate new artifacts in the reconstructed CT images, we train another neural network (PriorNet) to generate a good prior image to guide sinogram learning, and further design a novel residual sinogram learning strategy to effectively utilize the prior image information for better sinogram completion. The two networks are jointly trained in an end-to-end fashion with a differentiable forward projection (FP) operation so that the prior image generation and deep sinogram completion procedures can benefit from each other. Finally, the artifact-reduced CT images are reconstructed using the filtered backward projection (FBP) from the completed sinogram. Extensive experiments on simulated and real artifacts data demonstrate that our method produces superior artifact-reduced results while preserving the anatomical structures and outperforms other MAR methods.
Year
DOI
Venue
2021
10.1109/TMI.2020.3025064
IEEE Transactions on Medical Imaging
Keywords
DocType
Volume
Algorithms,Artifacts,Image Processing, Computer-Assisted,Metals,Phantoms, Imaging,Tomography, X-Ray Computed
Journal
40
Issue
ISSN
Citations 
1
0278-0062
2
PageRank 
References 
Authors
0.45
11
4
Name
Order
Citations
PageRank
Lequan Yu170639.80
Zhicheng Zhang2162.77
Xiaomeng Li3348.88
Lei Xing410223.72