Subarachnoid hemorrhage and venous thrombosis CT protocolsa
| Seriesb | Scan Type | Detector Configuration | Pitch | Speed | FOV (cm) | kVp | Auto mA | Rotation Time | Section Thickness | Reconstruction Interval | Prep Group | Amount | Saline Flush | Rate | ||
| Min | Max | NI | ||||||||||||||
| NCT | Helical | 32 × 0.625 | 0.969:1 | 19.37 | 22 | 120 | 100 | 350 | 4 | 1 | 2.5 | 2.5 | – | – | – | – |
| PCT1 | Cine | 8 × 5 | – | – | 22 | 80 | 100 | – | 1 | 5 | 5 | 7 | 40 | 25 | 5 | |
| PCT2 | Cine | 8 × 5 | – | – | 22 | 80 | 100 | – | 1 | 5 | 5 | 7 | 40 | 25 | 5 | |
| CTA | Helical | 64 × 0.625 | 0.984:1 | 98.42 | 25 | 120 | 200 | 400 | 12 | 0.4 | 0.625 | 0.5 | From PCT | 70 | 25 | 5 |
| CECT | Helical | 32 × 0.625 | 0.969:1 | 19.37 | 22 | 120 | 100 | 350 | 4 | 1 | 2.5 | 2.5 | 120 | – | – | – |
Note:—Min, minimum; Max, maximum; NCT indicates noncontrast CT; PCT, perfusion CT; –, not applicable; CTA, CT angiography; CECT, contrast-enhanced CT.
a For subarachnoid hemorrhage CT Protocol: CTA prep group = PCT1 timing of the arterial peak + 7 seconds for venous thrombosis CT protocol: CTA prep group = PCT1 timing of the arterial peak + 10 seconds.
b PCT1, above the orbits; PCT2, immediately adjacent to PCT1.