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| Category | Method | Limitation |
|---|---|---|
| Back-projection | Iterative Back-Projection (IBP) | Vulnerable to noise |
| Deterministic regularization | Simple bilinear INTerpolation (INT), LASR, TIKhonov (TIK), Direct Acquisition (DAC), THEOretical curves (THEO), conjugated gradients, and Low-Rank Total-Variation (LRTV) | Vulnerable to noise |
| Projection Onto Convex Sets (POCS) | Wavelet-based POCS SR and Toeplitz-based iterative SR | Slow convergence speed High computational cost |
