Table 1.
CT scan protocols.
| Manufacturer | Siemens | General Electric | Philips |
|---|---|---|---|
| Scanner model | Sensation 64 | Discovery 750 | Brilliance |
| Sequence | Axial | Axial | Axial |
| Gantry rotation time (s) | 0.5 | 0.5 | 0.5 |
| Tube voltage (kV) | 120 | 120 | 120 |
| Tube current (mA) | 200 | 250-400 | 180-450 |
| Detector collimation (mm) | 64×0.6 | 64×0.625 | 64×0.625 |
| Matrix | 512×512 | 512×512 | 512×512 |
| Pitch | 1.0 | 1.375 | 1.0 |
| Slice thickness (mm) | 5 | 5 | 5 |
| Corticomedullary phase (s) | 30 | 30 | 30 |
| Nephrographic phase (s) | 80 | 80 | 80 |
| Excretory phase (s) | 180 | 180 | 180 |
s, second; kV, kilovolt; mA, milliampere; mm, millimetre.