Fig. 9
Sinogram and corresponding reconstructed image of the OOC phantom described in “Best result on test dataset” section. The phantom consists of four sphere-shaped hot sources with radii of 0.4 mm, 0.5 mm, 0.6 mm, and 0.7 mm. The hot sources are surrounded by sphere-shaped cold sources with a radius of 2 mm each. The activity concentration of the hot sources is 1000 Bq/mm\(^3\) and 100 Bq/mm\(^3\) for the cold sources