Alternative methods, devoted to Filtered Back Projection (FBP) image reconstruction for J-PET scanner. The major tool, STIR, was utilized for the most tasks, with the help of SAFIR module, which implementation is available on the main J-PET repository. If you have an access to PET Wiki, the detailed description could be found in the coresponding section.
This repository contains other implementations of FBP, including TomoPy (with the ASTRA Toolbox 2D FBP incorporated) and R PET package.