no code implementations • 14 Dec 2015 • Hung Nien, Jeffrey A. Fessler
Statistical image reconstruction (SIR) methods are studied extensively for X-ray computed tomography (CT) due to the potential of acquiring CT scans with reduced X-ray dose while maintaining image quality.
no code implementations • 18 Feb 2014 • Hung Nien, Jeffrey A. Fessler
The augmented Lagrangian (AL) method that solves convex optimization problems with linear constraints has drawn more attention recently in imaging applications due to its decomposable structure for composite cost functions and empirical fast convergence rate under weak conditions.
no code implementations • 18 Feb 2014 • Hung Nien, Jeffrey A. Fessler
According to our analysis, we can show that the two-split ADMM algorithm can be faster than the SB method if the AL penalty parameter of the SB method is suboptimal.