Fig. 3
From: Monte Carlo-based quantitative pinhole SPECT reconstruction using a ray-tracing back-projector
TARCs for spherical VOIs with diameters equal to the physical diameter plus 8 mm (the length of two voxel sides). The results are shown for iterations 1–50 for a set of spheres in the empty (left) and water-filled (right) torsos. Only every fifth data point is marked for clarity. The TARCs rise initially, up to 10–15 iterations and remained constant up to 100 iterations, but only the initial 50 iterations are shown here