Table 3. Noise, NPS peaks, and average spatial frequencies for eight reconstruction methods and four dose levels.
| 50 mA | 100 mA | 150 mA | 200 mA | |
|---|---|---|---|---|
| Noise (HU) | ||||
| FBP | 41.3043 | 30.5444 | 25.0197 | 21.4577 |
| AV-30 | 32.5606 | 24.0994 | 19.7209 | 16.8955 |
| AV-50 | 26.7706 | 19.8267 | 16.2084 | 13.8587 |
| AV-80 | 18.4297 | 13.6588 | 11.1071 | 9.4756 |
| AV-100 | 13.1694 | 10.0578 | 8.1843 | 6.9447 |
| DL-L | 27.3244 | 19.4344 | 16.0818 | 13.9488 |
| DL-M | 21.9028 | 15.8037 | 13.1265 | 11.4632 |
| DL-H | 16.0927 | 11.8503 | 9.9109 | 8.7437 |
| fpeak (mm–1) | ||||
| FBP | 0.2362 | 0.2677 | 0.2992 | 0.2835 |
| AV-30 | 0.2047 | 0.2577 | 0.2362 | 0.2677 |
| AV-50 | 0.2047 | 0.2205 | 0.2047 | 0.2520 |
| AV-80 | 0.1890 | 0.1732 | 0.1260 | 0.1417 |
| AV-100 | 0.1575 | 0.1102 | 0.1260 | 0.1417 |
| DL-L | 0.2047 | 0.2677 | 0.2992 | 0.2835 |
| DL-M | 0.2047 | 0.2677 | 0.2677 | 0.2835 |
| DL-H | 0.2047 | 0.2205 | 0.2677 | 0.2835 |
| favg (mm–1) | ||||
| FBP | 0.3160 | 0.3188 | 0.3229 | 0.3213 |
| AV-30 | 0.2959 | 0.2989 | 0.3032 | 0.3017 |
| AV-50 | 0.2759 | 0.2788 | 0.2831 | 0.2825 |
| AV-80 | 0.2293 | 0.2314 | 0.2358 | 0.2355 |
| AV-100 | 0.1849 | 0.1895 | 0.1924 | 0.1934 |
| DL-L | 0.2980 | 0.3019 | 0.3080 | 0.3066 |
| DL-M | 0.2858 | 0.2926 | 0.2992 | 0.2987 |
| DL-H | 0.2638 | 0.2764 | 0.2848 | 0.2845 |
NPS, noise power spectrum; FBP, filtered back projection; AV, adaptive statistical iterative reconstruction-Veo; DL-L, deep learning image reconstruction-low; DL-M, deep learning image reconstruction-medium; DL-H, deep learning image reconstruction-high.