Fig. 1. Diagram of coded aperture imaging process

Fig. 2. (a) 11-dimensional extended coded aperture mask (the central part is the base coded aperture mask), (b) Schematic diagram of the point-source model imaging

Fig. 3. Schematic diagram of dataset construction process (color online)

Fig. 4. Schematic diagram of the CNN training model architecture (color online)

Fig. 5. CNR of different energy sources forming projections on the detector (color online)

Fig. 6. Relationship between CNR and capacity of datasets for orphan point-source

Fig. 7. Variations of reconstructed CNR of the model with different datasets varies with the imaging time

Fig. 8. Reconstruction results of diverse datasets models at different times when the source is at the center of the FOV (color online)

Fig. 9. Relationship between CNR and capacity of datasets for multi-point source

Fig. 10. Reconstruct results of different number of sources (circle is the actual location of sources, color online)

Fig. 11. Reconstruction results of different energy sources exist simultaneously (color online)