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. 2016 Jul 29;43(8):4866–4876. doi: 10.1118/1.4959551

FIG. 4.

FIG. 4.

Center slices of the reconstructed images and the corresponding profiles of the phantom containing nine spheres placed in air, reconstructed using the OE and OE-RR algorithms. The first column presents images obtained from the exact data while the second column from the data affected by resolution uncertainties; these images were reconstructed with OE without resolution recovery. The third column shows images obtained from the data affected by the resolution uncertainties but reconstructed using the OE-RR algorithm. Three different Compton camera configurations were investigated with changing distance between the scatterer (front detector) and the absorber (back detector): 30 mm (first row), 50 mm (second row), 70 mm (third row). The profiles presented in the right part of the figure (top: 30 mm, middle: 50 mm, and bottom: 70 mm) were drawn horizontally through the three middle spheres. “Phantom” profile corresponds to the true activity distribution, “Exact” profile was drawn through the images reconstructed from the exact data (i.e. simulated for detectors with perfect energy and spatial resolutions), and the NoRR and RR profiles correspond to the data acquired with detectors with limited resolutions and reconstructed without and with resolution recovery.