Table 1.
CT scanner characteristics utilised in this study
| Scanner | X-Ray tube | Gantry aperture [cm] | Focal spot size [mm] | Total filtration [mm] Al equivalent | Detector type | No. of detector element in z-axis | mA range and step size |
|---|---|---|---|---|---|---|---|
| Somatom Sensation 4 | Siemens Dura Alron-B | 70 | 0.5 × 0.7 0.8 × 1.2 |
2 mm PTFE + 0.6 mm Ti (head), 2 mm PTFE + 1.2 mm Ti (body) | Solid state (UFC) | 8 | 28-500 (1 mA steps) |
| Somatom Emotion 6 | Siemens Dura 422 MV | 70 | 0.5 × 0.8 0.7 × 0.8 |
6.3 (at 140 kV) | Solid state (UFC) | 16 | 20-345 (1 mA steps) |
| Somatom Emotion 16 | Siemens Dura 422 MV | 70 | 0.5 × 0.8 0.7 × 0.8 |
6.3 (at 140 kV) | Solid state (UFC) | 24 | 20-345 (1 mA steps) |
| Somatom Sensation 64 | Siemens Straton | 70 | 0.6 × 0.7 0.7 × 0.7 0.8 × 1.1 |
6.8 | Solid state (UFC) | 40 | 28-665 (1 mA steps) |