Mean image noise measured as an SD in Hounsfield units of images reconstructed at 3 and 1 mm
| 120 kV 100 mAs | 120 kV 50 mAs | 120 kV 25 mAs | 100 kV 100 mAs | 100 kV 50 mAs | 100 kV 25 mAs | |
|---|---|---|---|---|---|---|
| 3 mm | ||||||
| Hard kernel | ||||||
| FBP | 60.3 | 101.0 | 115,7 | 78.2 | 130.1 | 181.3 |
| SAFIRE I | 48.2 | 80.7 | 91.1 | 60.1 | 105.2 | 146.4 |
| SAFIRE II | 40.0 | 53.8 | 69.8 | 52.9 | 88.3 | 121.0 |
| SAFIRE III | 30.9 | 37.7 | 55.5 | 41.5 | 70.2 | 101.7 |
| SAFIRE IV | 28.1 | 29.3 | 39.8 | 33.8 | 52.1 | 94.0 |
| SAFIRE V | 19.6 | 24.5 | 30.6 | 23.7 | 39.0 | 78.1 |
| IRIS | 34.4 | 48.3 | 59.9 | 36.2 | 62.7 | 86.5 |
| Soft kernel | ||||||
| FBP | 7.2 | 8.2 | 14.1 | 8.3 | 11.7 | 16.7 |
| SAFIRE I | 5.9 | 6.7 | 11.0 | 7.1 | 11.2 | 12.8 |
| SAFIRE II | 5.4 | 5.3 | 9.3 | 7.3 | 10.8 | 12.1 |
| SAFIRE III | 3.4 | 4.7 | 10.2 | 8.1 | 10.3 | 15.4 |
| SAFIRE IV | 3.1 | 4.6 | 8.6 | 7.5 | 9.0 | 14.9 |
| SAFIRE V | 2.6 | 5.1 | 9.3 | 5.8 | 8.4 | 15.6 |
| IRIS | 4.3 | 5.4 | 10.2 | 7.8 | 10.9 | 15.6 |
| 1 mm | ||||||
| Hard kernel | ||||||
| FBP | 87.8 | 162.7 | 178.5 | 153.0 | 202.2 | 318.5 |
| SAFIRE I | 75.0 | 134.4 | 123.9 | 103.7 | 175.1 | 182.9 |
| SAFIRE II | 57.1 | 102.8 | 110.0 | 74.8 | 146.0 | 134.7 |
| SAFIRE III | 44.2 | 81.0 | 99.1 | 62.6 | 112.5 | 169.7 |
| SAFIRE IV | 30.5 | 47.7 | 85.3 | 44.7 | 96.0 | 151.7 |
| SAFIRE V | 27.6 | 23.6 | 48.0 | 28.9 | 59.2 | 153.2 |
| IRIS | 60.9 | 80.8 | 85.9 | 57.6 | 97.2 | 179.2 |
| Soft kernel | ||||||
| FBP | 13.7 | 15.6 | 18.1 | 12.3 | 22.0 | 29.8 |
| SAFIRE I | 9.4 | 9.2 | 11.6 | 9.1 | 21.3 | 23.6 |
| SAFIRE II | 4.6 | 7.5 | 11.0 | 8.9 | 17.7 | 20.6 |
| SAFIRE III | 4.8 | 6.3 | 10.6 | 7.7 | 15.9 | 22.6 |
| SAFIRE IV | 3.8 | 6.1 | 11.3 | 7.8 | 16.2 | 17.5 |
| SAFIRE V | 3.0 | 6.3 | 9.6 | 6.4 | 12.0 | 11.7 |
| IRIS | 8.3 | 11.4 | 9.7 | 8.7 | 10.8 | 25.2 |