Table 1 Artifact index study for some reconstructed images
Cases | Filter parameters | Noise filter (Low-dose data, FBP reconstruction) | Artifact indices | ||||
|---|---|---|---|---|---|---|---|
| Â | a | b | c | Slice 1 | Slice 32 | Slice 64 | |
1 | NA | NA | NA | No filter | 10,620 | 5030 | 8154 |
2 | 2.5 | 4 | −2.49975 | Proposed filter | 6285 | 4176 | 4718 |
3 | 2.5 | 3 | −2.49975 | Proposed filter | 5046 | 3756 | 3676 |
4 | 2.5 | 2 | −2.49975 | Proposed filter | 3787 | 3597 | 3434 |
5 | 2.5 | 1 | −2.49975 | Proposed filter | 3991 | 2524 | 3524 |
6 | 2.5 | 0.5 | −2.49975 | Proposed filter | 7306 | 4495 | 5909 |
7 | 0 | NA | 2 | Lowpass filter | 4930 | 3653 | 4103 |
8 | 0 | NA | 4 | Lowpass filter | 7698 | 5745 | 6959 |