Table 3.
Subjective image quality (IQ) and artefacts
| IQ criteria | 40% ASIR at routine dose |
Filtered back projection at lower dose |
40% ASIR at lower dose |
30% ASIR-V at lower dose |
50% ASIR-V at lower dose |
70% ASIR-V at lower dose |
Intraclass correlation coefficient | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| R1 | R2 | R1 | R2 | R1 | R2 | R1 | R2 | R1 | R2 | R1 | R2 | ||
| Sharpness | 4 | 4 | 2.31 | 2.4 | 3.08 | 3.19 | 3.71 | 3.85 | 3.67 | 3.79 | 2.31 | 2.42 | 0.692 |
| Subjective noise | 5 | 5 | 2.75 | 2.81 | 3.58 | 3.63 | 4.04 | 4.08 | 4.73 | 4.73 | 5 | 5 | 0.651 |
| Artefact | 4 | 4 | 2.98 | 3.04 | 3.56 | 3.62 | 3.98 | 3.98 | 4 | 4 | 4 | 4 | 0.682 |
| Diagnostic acceptability | 5 | 5 | 4.27 | 4.29 | 4.87 | 4.85 | 5 | 5 | 5 | 5 | 4.6 | 4.58 | 0.830 |
ASIR, adaptive statistical iterative reconstruction; R, reader.
Data are subjective image quality rating regarding sharpness, subjective noise, artefacts and diagnostic acceptability in comparison with baseline 40% ASIR image at routine dose rating for two readers.