Table 1 Scan parameters of low-dose and ultra-low-dose chest CT protocols
Protocol | Low-dose | Ultra-low-dose |
|---|---|---|
Scan type | Helical | Helical |
Rotation time (s) | 0.5 | 0.5 |
Beam collimation (mm) | 40 | 40 |
Detector configuration | 4 × 1.25 mm | 4 × 1.25 mm |
Pitch | 1.5 | 1.5 |
Speed (mm/rot) | 0.6 | 0.6 |
Tube voltage, kV | 100 | 100 |
Tube current, mA | 50 | 10 |
SFOV (scan field of view) | Large body | Large body |
CTDIvol (CT dose index) | 1.15 | 0.34 |