Table 1. Acquisition and reconstruction parameters of non-enhanced CT, CT angiography and CT perfusion.
| Parameter | NECT | CTA | CTP |
|---|---|---|---|
| Rotation time (s) | 1 | 0.5 | 1 |
| Tube voltage (kVp) | 120 | 100 | 80 |
| Tube current (mA) | 350 | 175 | 270 |
| Gantry tilt | yes | no | yes |
| Field of view (mm) | 250 | 250 | 200 |
| Iterative reconstruction | Yes^ | Yes^ | No |
| Reconstruction filter/kernel | Soft tissue | Soft tissue | Soft tissue |
| Primary reconstruction slice thickness/increment (mm) | 3/3 | 0.75/0.5 | 3/3 |
| Multiplanar reconstruction (slice/increment mm) | 4/4 transversal, coronal, sagittal | 3/3 transversal, sagittal | ¤ |
| Maximum intensity projection (slice/increment mm) | – | 12/2 transversal; 10/2 coronal, sagittal | ¤ |
| Iodine contrast agent concentration (mgI/mL) | – | 370–400 | 370–400 |
| Contrast volume (mL) | – | 60 | 50 |
| Injection rate (mL/s) | – | 5 | 6 |
| Z-axis coverage | Whole brain | From aortic arch to vertex | 38.6 mm |
¤, CTP was evaluated in entire acquired volume automatically by dedicated software; ^, Raw data based iterative reconstruction. CTA, CT angiography; CTP, CT perfusion; NECT, non-enhanced CT.