Sample synthetic projections at three consecutive Angles 2, 3, 4. The error maps between the synthetic and ground-truth corresponding projections are shown below each image. CUSIP and CUSP-DuRDN show obvious under-estimations in all angles, especially at the central cardiac regions. DuDoSS predicts the most consistent projections in all Angles 2, 3, and 4 compared with the ground-truth projections. Errors between the predicted and ground-truth projections are denoted with white arrows.