Table 2.
Technical settings for radiographic and CBCT imaging dose measurements. For the Pelvis AP and Head AP radiographic imaging protocols, the x-ray exposure was scaled for measurement by scaling the clinical x-ray exposure time. The clinical exposures and exposure times are given in brackets [].
| Pelvis | Head | Pelvis | Standard-dose | |
|---|---|---|---|---|
| AP | AP | CBCT | head CBCT | |
| X-ray voltage (kVp) | 80 | 100 | 125 | 100 |
| X-ray current (mA) | 200 | 200 | 80 | 20 |
| X-ray milliseconds (ms) | 1000 [50] | 1000 [40] | 13 | 20 |
| Gantry rotation range (deg) | Fixed | Fixed | 364 | 204 |
| Number of projections | 1 | 1 | 655 | 360 |
| X-ray exposure (mAs) | 200 [10] | 200 [8] | 681 | 144 |
| Fan type | Half | Full | Half | Full |
| Bowtie filter | Half | Full | Half | Full |
| Blade X1 (cm) | 6.8 | 13.6 | 6.8 | 13.6 |
| Blade X2 (cm) | 23.5 | 13.6 | 23.5 | 13.6 |
| Blade Y1 (cm) | 10.3 | 9.2 | 10.3 | 9.2 |
| Blade Y2 (cm) | 10.3 | 9.2 | 10.3 | 9.2 |