Table 2.
CT number in each reconstruction algorithm at different radiation doses.
| Radiation dose | Contrast | Reconstruction algorithm | ||||
|---|---|---|---|---|---|---|
| FBP | HIR | MBIR | DLR | |||
| CT number | 100% | High (340 HU) | 333.4 ± 16.3 | 330.4 ± 8.7 | 318.5 ± 16.4 | 337.2 ± 7.7 |
| Moderate (120 HU) | 124.1 ± 16.1 | 121.7 ± 8.1 | 121.0 ± 6.4 | 120.1 ± 6.5 | ||
| Low (−35 HU) | −35.4 ± 14.8 | −31.6 ± 11 | −32.8 ± 8.8 | −34.8 ± 10.4 | ||
| 50% | High (340 HU) | 335.9 ± 33 | 334.6 ± 14.3 | 320.3 ± 16.9 | 342.7 ± 12.4 | |
| Moderate (120 HU) | 112.8 ± 32.6 | 118.3 ± 10.7 | 119.2 ± 7.5 | 116.6 ± 7.2 | ||
| Low (−35 HU) | −33 ± 17.3 | −32.6 ± 7.7 | −33.8 ± 6.5 | −34.6 ± 6.5 | ||
| 25% | High (340 HU) | 335.9 ± 45.8 | 327.7 ± 9.7 | 319 ± 10.5 | 334.5 ± 11 | |
| Moderate (120 HU) | 125.3 ± 36.7 | 124.2 ± 11.5 | 126.2 ± 10.7 | 120.9 ± 8.1 | ||
| Low (−35 HU) | −39.3 ± 34.8 | −28.9 ± 8.2 | −31.8 ± 6.7 | −30.6 ± 7.5 | ||
Abbreviations: DLR, deep learning‐based reconstruction; FBP, filtered back projection; HIR, hybrid iterative reconstruction; HU, Hounsfield units; MBIR, model‐based iterative reconstruction.