TABLE III.
PSNR, ISNR, and SSIM Values of ROI (rhombus) by Different Reconstruction Algorithms for the Cs Phantom
| Incident photon | Penalty | Noise level (×10−5) | PSNR | I SNR | SSIM | 
|---|---|---|---|---|---|
| 5×103 | FDK | 120 | 25.76 | / | 0.66 | 
| TV | 3.51 | 35.38 | 9.61 | 0.95 | |
| Ours | 3.46 | 38.32 | 12.55 | 0.98 | |
| 1×104 | FDK | 95.20 | 28.84 | / | 0.79 | 
| TV | 2.79 | 36.72 | 7.87 | 0.96 | |
| Ours | 2.74 | 39.36 | 10.52 | 0.98 | |
| 5×104 | FDK | 52.10 | 33.93 | / | 0.93 | 
| TV | 1.96 | 39.98 | 6.05 | 0.98 | |
| Ours | 1.96 | 40.87 | 6.94 | 0.98 |