CTA protocol
| CTA Routine | CTA Postclipping | |
|---|---|---|
| Pre-CTA | Routine head precontrast | Routine head precontrast |
| Coverage | C1–2 to 2 cm below the inner table of the vertex | C1–2 to 2 cm below the inner table of the vertex |
| Acquisition | Helical | Helical |
| Detectors | 16i (64i) | 16i (64i) |
| Rotation time | 0.6 seconds | 0.6 seconds |
| Section thickness | 0.625 mm | 0.625 mm |
| Pitch | 0.938:1 (0.969:1) | 0.562:1 (0.531:1) |
| Table speed | 9.38 cm/s (19.37 cm/s) | 5.62 cm/s (10.62 cm/s) |
| Scanning FOV | 25 cm (32 cm) | 25 cm (32 cm) |
| kV(p) | 120 | 120 |
| mA | 750 | 750 |
| Display FOV | 15 cm | 15 cm |
| Algorithm | Standard | Standard |
| Contrast injection | Dual injector: 50-mL Omnipaque 300,* 4 mL/s; 40 mL saline, 2.5 mL/s | Dual injector: 50 mL Omnipaque 300,* 4 mL/s; 40 mL saline, 2.5 mL/s |
| Reconstruction | Sagittal and coronal MPRs, 2.5 mm thick × 2.0-mm spacing | Sagittal and coronal MPRs, 2.5 mm thick × 2.0-mm spacing |
Note:—MPR indicates multiplanar reconstruction image; FOV, field of view.
* Omnipaque 300 (iohexol), GE Health, Piscataway, NJ.