Table 2.
Technical specifications of different types of portal imaging technologies.
| Technical specifications | Solid-State aSi flat panel detector | LCD Camera | Digital luminescence radiography | Water cooled Solid-State CCD Camera |
|---|---|---|---|---|
| Siemens OPTIVUE 500 | Siemens Beamview TI | KODAK 2000RT CR Plus System | TheraView Digital Imaging System | |
| FOV at detector level | 41×41 cm | 40×30 cm | 35×43 cm | 40×40 cm |
| FOV at Isocenter | 29×29 cm | 32×27 cm | NA | 28×28 cm |
| Spatial resolution mm/pixel | 0.4 | 0.8 | 0.255 | 0.78 |
| Pixel format | 1024×1024 12-bit Grayscale | 512×512 12-bit Grayscale | 1200×1600 10-bit Grayscale | 1024×1024 12-bit Grayscale |
| Readout (max) frames/second | 3.5 | 3.0 | NA | 3.5 |
| MTF (F50) 6MV | 0.41 | 0.2 | NA | 0.34 |
| Weight (kg) | 96.9 | 80 | ||
| Mounting location | Gantry base | Gantry head | Portable (under treatment table) | Gantry base |