Table 3.
Imaging- and CM parameters of the two scanners
| Scanner-A | Scanner-B | |
|---|---|---|
| Detector collimation (mm) | 64 × 0.625 | 80 × 0.5 |
| Section/interval thickness (mm) | 5.0/5.0 | 5.0/5.0 |
| Gantry rotation time (ms) | 500 | 500 |
| Tube voltage (kVp) | 120 | 120 |
| Tube current (mA) | AECa | AECb |
| Beam pitch | 0.769 | 0.813 |
| Image reconstruction | iDose4 (level 3) | AIDR-3D (weak) |
| Reconstruction kernel | B | FC03 |
| CM dose (mgI kg–1) | 600 | 600 |
| Injection duration (s) | 30 | 30 |
| Bolus tracking threshold (HU) | 150 | 150 |
| Scan delay (s) | 18, 55, 160 | 18, 55, 160 |
AEC, automatic exposure control; CM, contrast material; HU, Hounsfield unit.
a
Reference tube current time product was set at 285 mAs (effective).
b
The noise index was set at 10 HU for a section thickness of 5 mm.