Parameters of SP-CTA, PCT, and MP-CTA protocol
| Parameter | SP-CTA | PCT | MP-CTA |
|---|---|---|---|
| Detector number | 64 | 64 | 64 |
| Scanning mode | Helical | Cine | Cine |
| Coverage length | 40.0 mm | 40.0 mm | 40.0 mm |
| Reconstructed section thickness | 0.625 mm | 5.0 mm | 0.625 mm |
| Pitch | 0.516:1 | – | – |
| Speed | 20.62 (mm/rot) | – | – |
| Rotation time | 0.4 second | 1.0 second | 1.0 second |
| Coverage speed | 51.55 mm/s | – | – |
| No. of images per rotation | – | 8i | 64i |
| Cine time interval | – | 0.5 second | 0.5 second |
| kVp | 120 | 80 | 80 |
| mA | 350 | 180 | 180 |
| Contrast volume | 60 mL | 30 mL | 30 mL |
| CTDI | 51.72 | 623.31 | 623.31 |
| Scanning range | No limitation | 40 mm | 40 mm |
| Phase selection | No | Yes | Yes |
Note:—rot indicates rotation; –, not applicable; CTDI, CT dose index; SP-CTA, single-phase CT angiography; PCT, perfusion CT; MP-CTA, multiphase CT angiography.