Table 1.
System parameters of the prototype silicon-based photon-counting computed tomography (Si-PCCT) and clinical energy-integrating detector CT (EIDCT) systems
| Si-PCCT | EIDCT | |
|---|---|---|
| Detector material | Silicon semiconductor | Gemstone scintillator |
| CTDIvol (32 cm) | 8.9 mGy | 9 mGy |
| Scan mode | Helical | Helical |
| Pitch | 0.99 | 0.98 |
| Bowtie filter | Medium | Head (medium body) |
| Tube voltage | 120 kVp | 120 kVp |
| Tube current | 255 mA | 245 mA |
| Tube rotation | 0.5 s | 0.5 s |
| Focal spot size | 0.6 mm | 1.2 mm |
| z-coverage | 40 mm | 40 mm |
| Matrix | 1024 × 1024 | 512 × 512 |
| Field-of-view (FOV) | 150 × 150 mm (150-mm FOV) 50 × 50 mm (50-mm FOV) | 150 × 150 mm (150-mm FOV) 50 × 50 mm (50-mm FOV) |
| Pixel size | 0.146 mm (150-mm FOV) 0.049 mm (50-mm FOV) | 0.293 mm (150-mm FOV) 0.098 mm (50-mmFOV) |
| Slice thickness | 0.42 mm | 0.63 mm |
| Kernel | Bone + ASIR0 | Bone + ASIR0 |
ASIR0 Adaptive statistical iterative reconstruction with 0% blending, CTDIvol Volumetric computed tomography dose index, EIDCT Energy-integrating computed tomography, PCCT Photon-counting computed tomography, FOV Field-of-view