Relaxed Ordered Subset Preconditioned Alternating Projection Algorithm for PET Reconstruction with Automated Penalty Weight Selection

摘要

Purpose:Performance of the preconditioned alternating projection algorithm (PAPA) using relaxed ordered subsets (ROS) with a non-smooth penalty function was investigated in positron emission tomography (PET). A higher order total variation (HOTV) regularizer was applied and a method for unsupervised selection of penalty weights based on the measured data is introduced.