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Table 1
Technical parameters for both systems.
| Application | O-ring system | C-arm system |
|---|---|---|
| 2D imaging | Yes | Yes |
| 3D imaging | Yes | Yes |
| Slice width | 0.83 mm | 0.312 or 0.5 mm |
| Standard 3D volume | Cylinder 20 cm (diameter)*15 cm (height) | 16*16*16 cm3 |
| Compatible navigation | Medtronic | Brainlab – Striker |
| Pulse frequency | 30 | 1, 2, 4, 8, 12.5, 25 |
| Choice of pulse rate | Fixed to 30 pps | Variable |
| Physical system | ||
| Technology of detector | Amorphous Silicon | Amorphous Silicon |
| Scintillator | Caesium Iodide | Caesium Iodide |
| Detector pixel length | 194 μm | 194 μm |
| 3D spatial resolution | 512*512*192 voxels | 3203voxels = cuts to 0.32 mm 5123voxels = cuts to 0.5 mm |
| Detector dimensions | 39.7*29.8 cm2 | 29.8*29.8 cm2 |
| Resolution | 1.29 lp/mm | 2.6 lp/mm |
| DQE (detective quantum efficiency) to 0 lp/mm | 77% | 70 ± 5% |
| X-ray generator power | 32 kW | 25 kW |
| kV Tube rating | 40–120 | 40–120 |
| Regulation of mA | 10, 12.5, 16, 20, 25, 32, 40, 50, 64, 80, 100, 125, 160, 200, 250, 320 | 1.5 to 250 |
| Distance focal – detector | 117 cm | 104.5 cm |
| Opening | 96.5 cm | 84 cm |
| Weight | 885 kg | 415 kg |
| Angulation for 3D acquisition | 360° | 180° |
| Total filtration | > 4 mm Al | ≥ 4.3 mm Al, including 0.1 mm Cu |
| Dosimetric quantities provided | ||
| CTDI | [mGy] | |
| DLP | [mGy cm] | |
| DAP | [Gy cm2] |
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