Fig. 4From: Monte Carlo-based quantitative pinhole SPECT reconstruction using a ray-tracing back-projectorARCs for spherical VOIs with diameters equal to the sphere diameter. The results are shown for iterations 1–100 for spheres in the empty (left) and water-filled (right) torsos. Only every 10th data point is marked for better clarity. The ARCs increase rapidly initially and continue to increase up to the user-selected endpoint of 100 iterationsBack to article page