Table 5.
Comparison between 2ABD in digital mammography and digital breast tomosynthesis for different phantom thicknesses on the reference Hologic Selenia Dimensions (device A)
| Phantom thickness (cm) | Digital mammography (single view) (W/Rh and W/Ag*) | Digital breast tomosynthesis (W/Al) | ||||
|---|---|---|---|---|---|---|
| Tube load (mAs) | Tube voltage (kVp) | 2ABD (mGy) | Tube load (mAs) | Tube voltage (kVp) | 2ABD (mGy) | |
| 2.5 | 50 | 26 | 0.49 ± 0.11 | 39 | 27 | 0.95 ± 0.21 |
| 3.0 | 67 | 26 | 0.61 ± 0.15 | 38 | 28 | 0.95 ± 0.19 |
| 3.5 | 72 | 27 | 0.67 ± 0.15 | 40 | 29 | 1.05 ± 0.20 |
| 4.0 | 82 | 28 | 0.77 ± 0.16 | 49 | 29 | 1.18 ± 0.23 |
| 4.5 | 98 | 28 | 0.85 ± 0.18 | 50 | 30 | 1.26 ± 0.23 |
| 5.0 | 134 | 29 | 1.20 ± 0.24 | 55 | 31 | 1.45 ± 0.26 |
| 5.5 | 138 | 30 | 1.26 ± 0.23 | 60 | 32 | 1.66 ± 0.30 |
| 6.0 | 155 | 31 | 1.43 ± 0.26 | 65 | 33 | 1.86 ± 0.33 |
| 6.5 | 161 | 32 | 1.51 ± 0.28 | 71 | 34 | 2.13 ± 0.38 |
| 7.0* | 159 | 30 | 1.73 ± 0.36 | 78 | 35 | 2.43 ± 0.43 |
| 7.5* | 174 | 31 | 1.96 ± 0.40 | 82 | 36 | 2.70 ± 0.47 |
Data for 2ABD are presented as mean ± standard deviation. In DM modality, the W-Rh anode-filter combination was selected by the AEC system for a range of 2.5–6.5 cm of phantom thickness, while for a thickness of 7 cm and 7.5 cm the W-Ag (*) was automatically set. On the other hand, only the W-Al option was available for DBT