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Reconstructed 4D NCAT phantom at phase 0 (end-expiration) by using 4 different reconstruction algorithms with average projection numbers of 20. FDK: Feldkamp–Davis–Kress; TV: total variation. SMEIR: simultaneous motion estimation and image reconstruction. First through third columns show the transaxial, coronal, and sagittal views, respectively. Display window for all images is [0, 0.05] mm−1.
