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| Nomalized NCC | Normalized LPCC | p value | |
| Artifact-free images (n = 33) | 0.98±0.01 | 0.94±0.04 | 1.33×10−5 |
| Artifacts images (n = 33) | 0.84±0.12 | 0.68±0.14 | 5.30×10−7 |
| Relative difference (n = 33) | 0.15±0.12 | 0.27±0.14 | 5.32×10−7 |
Note: NCC: normalized correlation coefficient; LPCC: local Pearson correlation coefficient with sub-window of 8×8 pixels; relative difference = (Coefficientartifact-free − Coefficientartifact)/Coefficientartifact-free.
