Table 1 Scanning parameters for the initial “low-dose” and suggested “ultra-low-dose” CT protocol according to body weight
CT protocol | ||||
|---|---|---|---|---|
Initial “low dose” | Suggested “ultra-low dose” | |||
Body weight | ||||
< 80 kg | ≥ 80 kg | < 80 kg | ≥ 80 kg | |
Scanning parameters | ||||
kV | 120 | 120 | 120 | 120 |
mA | 60 | 60 | 30 | 30 |
Rotation time | 0.75 | 0.75 | 0.75 | 0.75 |
mAs (mA × time) | 45 | 45 | 22 | 22 |
Pitch | 1.4 | 1.4 | 1.4 | 1.4 |
Eff mAs (mAs/pitch) | 32 | 32 | 16 | 16 |
Slice thickness (mm) | 5 | 5 | 5 | 5 |
Slice thickness recon | 1.5 | 1.5 | 1.5 | 1.5 |
Field of view (FOV) | 350 | 350 | 350 | 350 |
Matrix size | 512 × 512 | 512 × 512 | 512 × 512 | 512 × 512 |