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CT images reconstructed from 66 projections over 360° using (b) standard FBP; (c) ABOCS; (d) conventional regularization using Eq. 2; (e) ASD-POCS; (f) ASD-POCS with ten iterations only for a total computation time comparable to that of (c). (a) Ground truth. The image RMSEs from (b) to (f) are: 211, 24, 24, 24, and 93 HU, respectively. Display window: [−500, 500] HU. The computation time is shown under each iterative algorithm name.
