TABLE 2.
Mean Image Noise According to Dose and Reconstruction Method
| With IV Contrast Enhancement (n = 21) | Without IV Contrast Enhancement (n = 24) | Entire Cohort (n = 45) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Site | Low- Dose FBP |
Low- Dose ASIR |
Low-Dose MBIR |
Standard- Dose FBP |
Low- Dose FBP |
Low- Dose ASIR |
Low-Dose MBIR |
Standard- Dose FBP |
Low- Dose FBP |
Low- Dose ASIR |
Low-Dose MBIR |
Standard- Dose FBP |
| Liver | 44.5 | 48.5 | 14.1 | 23.8 | 79.4 | 60.3 | 16.3 | 33.9 | 63.1 | 48.3 | 15.3 | 29.2 |
| Kidney | 44.9 | 35.0 | 16.0 | 26.7 | 73.0 | 55.9 | 14.4 | 33.7 | 59.8 | 46.1 | 15.1 | 30.4 |
| Fat | 38.7 | 30.0 | 11.4 | 21.7 | 69.1 | 53.7 | 14.6 | 30.3 | 54.9 | 42.6 | 13.1 | 26.3 |
| Muscle | 42.7 | 33.1 | 15.3 | 25.4 | 73.0 | 55.8 | 15.5 | 33.3 | 58.8 | 45.2 | 15.4 | 29.6 |
| Total | 42.7 | 36.7 | 14.2 | 24.4 | 73.6 | 56.4 | 15.2 | 32.8 | 59.2 | 45.6 | 14.7 | 28.9 |
Note—All measurements are in HU. Image noise refers to the SD around the mean region-of-interest attenuation measurement. FBP = filtered back-projection, ASIR = adaptive statistical iterative reconstruction, MBIR = model-based iterative reconstruction.