Table 1.
List of configurations and parameters that were analyzed. Five parameters were changed in order to create different configurations; number of projection views, total angular span, entrance dose, distribution of the mAs, and detector resolution. Some configurations are described by multiple groups and therefore appear multiple times in the table. Differences in entrance dose for equal mAs values can be attributed to different source to object distances for different x-ray sources. MMOC stands for more mAs on central projections. LMOC stands for less mAs on central projections.
| Group | Number of projections | Total angular span | Angular spacing | Entrance dose (mR) | Detector resolution (μm) | Distribution of the mAs |
|---|---|---|---|---|---|---|
| 1 | 15 | 14° | 1° | 727 | 140 | Uniform |
| 1 | 15 | 28° | 2° | 682 | 140 | Uniform |
| 2 | 15 | 28° | 2° | 682 | 140 | Uniform |
| 2 | 29 | 28° | 1° | 656 | 140 | Uniform |
| 3 | 29 | 28° | 1° | 656 | 140 | Uniform |
| 3 | 29 | 28° | 1° | 665 | 140 | LMOC |
| 3 | 29 | 28° | 1° | 675 | 140 | MMOC |
| 4 | 29 | 28° | 1° | 385 | 140 | Uniform |
| 4 | 29 | 28° | 1° | 523 | 140 | Uniform |
| 4 | 29 | 28° | 1° | 656 | 140 | Uniform |
| 4 | 29 | 28° | 1° | 791 | 140 | Uniform |
| 5 | 15 | 28° | 2° | 682 | 70 | Uniform |
| 5 | 15 | 28° | 2° | 682 | 140 | Uniform |