Table 3.
Scores of subjective evaluations according to the reconstruction methods
| Reader 1a | Reader 2a | Pooled resultsb | |||||||
|---|---|---|---|---|---|---|---|---|---|
| FBP | 50% ASiR | 3D-IIR | FBP | 50% ASiR | 3D-IIR | FBP | 50% ASiR | 3D-IIR | |
| Subjective noise | 0/30/1/0/0 | 0/0/25/6/0 | 0/0/0/0/31 | 0/1/29/1/0 | 0/0/1/30/0 | 0/0/0/0/31 | 2.5 ± 0.5 | 3.6 ± 0.5 | 5.0 ± 0.0 |
| Artifacts | 0/0/6/16/9 | 0/0/6/16/9 | 0/0/6/16/9 | 0/0/2/9/20 | 0/0/0/2/29 | 0/0/0/0/31 | 4.3 ± 0.7 | 4.5 ± 0.7 | 4.5 ± 0.7 |
| Visualization of small or thin structures | 0/0/14/17/0 | 0/0/0/10/21 | 0/0/0/6/25 | 0/0/10/20/1 | 0/0/3/28/0 | 0/0/0/4/27 | 2.2 ± 0.6 | 4.3 ± 0.6 | 4.8 ± 0.4 |
| Visualization of the intrahepatic vasculature | 0/1/14/16/0 | 0/1/8/20/2 | 0/0/2/10/19 | 0/0/8/23/0 | 0/0/4/27/0 | 0/0/0/5/26 | 2.2 ± 0.6 | 3.8 ± 0.5 | 4.7 ± 0.5 |
| Diagnostic acceptability | 0/3/24/4/0 | 0/1/8/22/0 | 0/0/0/7/24 | 0/0/14/17/0 | 0/0/2/29/0 | 0/0/0/2/29 | 1.9 ± 0.5 | 3.8 ± 0.4 | 4.9 ± 0.4 |
FBP, filtered back projection; ASiR, adaptive statistical iterative reconstruction; 3D-IIR, three-dimensional iterative image reconstruction
a
Data show the frequencies of scores for each category (Grade 1/2/3/4/5).
b
Data show the means ± standard deviation of the two readers’ scores for the 31 patients.