title: Edge guided image reconstruction in linear scan CT by weighted alternating direction TV minimization.
abstract: Linear scan computed tomography (CT) is a promising imaging configuration with high scanning efficiency while the data set is under-sampled and angularly limited for which high quality image reconstruction is challenging. In this work, an edge guided total variation minimization reconstruction (EGTVM) algorithm is developed in dealing with this problem. The proposed method is modeled on the combination of total variation (TV) regularization and iterative edge detection strategy. In the proposed method, the edge weights of intermediate reconstructions are incorporated into the TV objective function. The optimization is efficiently solved by applying alternating direction method of multipliers. A prudential and conservative edge detection strategy proposed in this paper can obtain the true edges while restricting the errors within an acceptable degree. Based on the comparison on both simulation studies and real CT data set reconstructions, EGTVM provides comparable or even better quality compared to the non-edge guided reconstruction and adaptive steepest descent-projection onto convex sets method. With the utilization of weighted alternating direction TV minimization and edge detection, EGTVM achieves fast and robust convergence and reconstructs high quality image when applied in linear scan CT with under-sampled data set.
authors.affiliation: National Digital Switching System Engineering and Technological R&D Centre, Zhengzhou, Henan, China.
authors.forename: Ailong
authors.initials: A
authors.lastname: Cai
authors.affiliation: National Digital Switching System Engineering and Technological R&D Centre, Zhengzhou, Henan, China.
authors.forename: Linyuan
authors.initials: L
authors.lastname: Wang
authors.affiliation: National Digital Switching System Engineering and Technological R&D Centre, Zhengzhou, Henan, China.
authors.forename: Hanming
authors.initials: H
authors.lastname: Zhang
authors.affiliation: National Digital Switching System Engineering and Technological R&D Centre, Zhengzhou, Henan, China.
authors.forename: Bin
authors.initials: B
authors.lastname: Yan
authors.affiliation: National Digital Switching System Engineering and Technological R&D Centre, Zhengzhou, Henan, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Li
authors.affiliation: National Digital Switching System Engineering and Technological R&D Centre, Zhengzhou, Henan, China.
authors.forename: Xiaoqi
authors.initials: X
authors.lastname: Xi
authors.affiliation: National Digital Switching System Engineering and Technological R&D Centre, Zhengzhou, Henan, China.
authors.forename: Jianxin
authors.initials: J
authors.lastname: Li
mesh_terms: D000465:Algorithms; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D019047:Phantoms, Imaging; D014057:Tomography, X-Ray Computed / Q000379:methods*
keywords: Linear scan computed tomography; alternating direction method; edge guided reconstruction; limited angle problem; weighted total variation minimization