Table 1. Three types of scan parameters.
| Scan type | Chest CT | Non-contrast cardiac CT | Coronary CTA |
|---|---|---|---|
| Scan range | From the apex of the lungs to the lung bases | From the carina to the apex of the heart | From the carina to the apex of the heart |
| Tube voltage | Modulated tube voltage (70–120 kV) | 120 kVp | Modulated tube voltage (80–120 kV) |
| Tube current | Modulated tube current with a reference value of 80 mAs | Modulated tube current with a reference value of 85 mAs | Modulated tube current (300–700 mAs) |
| Collimation (mm) | 2×192×0.6 | 2×192×0.6 | 2×192×0.6 |
| Gantry rotation time (s) | 0.25 | 0.25 | 0.25 |
| Field of view (mm) | 350 | 155 | 155 |
| Matrix | 512×512 | 512×512 | 512×512 |
| Slice width (mm) | 1/3/5 | 3 | 0.75 |
| Increment (mm) | 1/3/5 | 1.5 | 0.5 |
CT, computed tomography; CTA, computed tomography artery.