Table 1 Scan parameters.
Parameter | P1 | P2 | P3 | P4 | P5 | P6 | P7 | P8 | P9 |
|---|---|---|---|---|---|---|---|---|---|
Tube voltage [kVp] | 140 | 140 | 140 | 140 | 140 | 140 | 140 | 140 | 140 |
Mean eff. tube current [mAs] | 52.9 ± 12.7 | 52.5 ± 12.3 | 52.0 ± 11.4 | 52.6 ± 12.3 | 52.5 ± 12.3 | 52.6 ± 12.3 | 53.4 ± 11.5 | 12.5 ± 12.3 | 52.8 ± 12.2 |
Collimation [mm] | 120 × 0.2 | 120 × 0.2 | 120 × 0.2 | 120 × 0.2 | 120 × 0.2 | 120 × 0.2 | 120 × 0.2 | 120 × 0.2 | 120 × 0.2 |
Pitch factor | 0.3 | 1.0 | 1.2 | 0.3 | 1.0 | 1.2 | 0.3 | 1.0 | 1.2 |
Gantry rotation time [sec] | 0.25 | 0.25 | 0.25 | 0.5 | 0.5 | 0.5 | 1.0 | 1.0 | 1.0 |
Mean CTDIvol [mGy] | 6.4 ± 1.5 | 6.3 ± 1.3 | 6.2 ± 1.2 | 6.2 ± 1.4 | 6.2 ± 1.3 | 6.2 ± 1.3 | 6.3 ± 1.3 | 6.2 ± 1.3 | 6.2 ± 1.3 |
Mean SSDE [mGy] | 9.2 ± 1.6 | 9.0 ± 1.4 | 9.0 ± 1.3 | 9.0 ± 1.4 | 9.0 ± 1.5 | 9.0 ± 1.4 | 9.1 ± 1.4 | 9.0 ± 1.5 | 9.0 ± 1.4 |
