Table 1 Technical parameters of a vascular ring protocol
From: Computed tomography in the evaluation of vascular rings and slings
Parameters | ECG gated | Non-ECG gated |
|---|---|---|
Gating | Prospective ECG triggered (40 % R-R interval) | None |
Scan mode | Axial, step and shoot | Helical |
Detector collimation | 128 × 0.625 mm, adaptive z collimation | 128 × 0.625 mm, adaptive z collimation |
Gantry rotation time | 270 ms | 270 ms |
Temporal resolution | 135 ms | 135 ms |
Scan length | Thoracic inlet to diaphragm | Thoracic inlet to diaphragm |
Pitch | – | 1.375 |
Tube voltage | 80 kV | 80 kV |
Tube current | 0–3 kg–60 mAs/slice 3–6 kg–80 mAs/slice 6–10 kg–100 mAs/slice 10–15 kg–120 mAs/slice | 0–3 kg–60 mAs/slice 3–6 kg–80 mAs/slice 6–10 kg–100 mAs/slice 10–15 kg–120 mAs/slice |
Reconstructed slice thickness | 0.9 mm | 0.9 mm |
Slice interval | 0.45 mm | 0.4 mm |
Reconstruction algorithm 4 | Idose- level 3 | Idose- level 3 |
Contrast | 1–2 ml/kg | 1–2 ml/kg |
Injection rate | 1–3 ml/s | 1–3 ml/s |
Contrast timing | Empirical | Empirical |