Optimization-based image reconstruction in x-ray computed tomography by sparsity exploitation of local continuity and nonlocal spatial self-similarity

Zhang Han-Ming, Wang Lin-Yuan, Li Lei, Yan Bin^†,, Cai Ai-Long, Hu Guo-En

Zoomed-in views of images reconstructed using the (a) FBP, (b) TV-ADM, and (c) HTV-ADM methods from 360- (1^st row), 180- (2^nd row), 120- (3^rd row), and 72-view (4^th row) projections, respectively. Display window is [0.0047, 0.08] mm⁻¹.