Table 1 HRCT techniques used in this study
| Machine | Toshiba Aquilion MSCT 64 channels |
|---|---|
| Scout | Kv120 mA50 Holding breath |
| HRCT protocol | |
| Scan type | Helical |
| Detector row | 64 |
| Helical thickness | 1.0 mm |
| Pitch | 1.484 |
| Speed | 0.5 |
| Detector | 64×0.5 |
| Beam collimation | 32.0 mm |
| Interval | 1.0 cm |
| Gantry tilt | 0.0 |
| FOV | Depends on the patient’s size |
| Kv | 120–140 |
| mA | 120–160 |
| Total exposure | 4–10 s |
| Inspiratory phase | Holding breath in full inspiration |