Table 4.
Comparison between 2ABD computed from Eq. (1) and the average glandular dose (AGD) calculated by the Dance approach for 100% glandularity
| Mammographic device | Phantom thickness (cm) | Tube load (mAs) | Tube voltage (kVp) | 2ABD (mGy) | AGD 100% glandularity (mGy) | Relative difference (%) |
|---|---|---|---|---|---|---|
| Hologic-A | 3.0 | 37.5 | 28 | 0.94 ± 0.19 | 1.00 ± 0.20 | -6.0 |
| Hologic-A | 3.5 | 40 | 29 | 1.05 ± 0.20 | 1.07 ± 0.21 | -1.9 |
| Hologic-A | 4.0 | 50 | 29 | 1.21 ± 0.23 | 1.21 ± 0.24 | 0.0 |
| Hologic-A | 4.5 | 50 | 30 | 1.26 ± 0.23 | 1.27 ± 0.25 | -0.8 |
| Hologic-A | 5.0 | 55 | 31 | 1.45 ± 0.26 | 1.46 ± 0.29 | -0.7 |
| Hologic-A | 5.5 | 60 | 32 | 1.66 ± 0.30 | 1.67 ± 0.33 | -0.6 |
| Hologic-A | 6.0 | 65 | 33 | 1.87 ± 0.33 | 1.89 ± 0.38 | -1.1 |
| Hologic-A | 6.5 | 70 | 34 | 2.12 ± 0.37 | 2.14 ± 0.43 | -0.9 |
| Hologic-A | 7.0 | 80 | 35 | 2.51 ± 0.44 | 2.57 ± 0.51 | -2.3 |
| Hologic-B | 3.5 | 30 | 29 | 1.07 ± 0.20 | 1.14 ± 0.23 | -6.1 |
| Hologic-B | 4.5 | 35 | 30 | 1.20 ± 0.22 | 1.22 ± 0.24 | -1.6 |
| Hologic-B | 5.5 | 42.5 | 32 | 1.61 ± 0.29 | 1.64 ± 0.33 | -1.8 |
| Hologic-B | 6.5 | 50 | 34 | 2.06 ± 0.37 | 2.09 ± 0.42 | -1.4 |
| Fuji-C | 3.5 | 28 | 29 | 1.19 ± 0.24 | 1.21 ± 0.24 | -1.7 |
| Fuji-C | 4.5 | 32 | 32 | 1.63 ± 0.30 | 1.56 ± 0.31 | 4.5 |
| Fuji-C | 5.5 | 42 | 33 | 2.06 ± 0.37 | 2.04 ± 0.41 | 1.0 |
| Fuji-C | 6.5 | 50 | 35 | 2.66 ± 0.47 | 2.65 ± 0.53 | 0.4 |
| Fuji-C | 4.5* | 45 | 32 | 2.30 ± 0.43 | 2.15 ± 0.43 | 7.0 |
| Fuji-C | 6.5* | 63 | 35 | 3.35 ± 0.59 | 3.27 ± 0.65 | 2.4 |
| Fuji-D | 3.5 | 28 | 30 | 1.30 ± 0.26 | 1.38 ± 0.28 | -5.8 |
| Fuji-D | 4.5 | 32 | 32 | 1.59 ± 0.30 | 1.60 ± 0.32 | -0.6 |
| Fuji-D | 5.5 | 50 | 33 | 2.40 ± 0.43 | 2.43 ± 0.49 | -1.2 |
| Fuji-D | 6.5 | 56 | 35 | 2.91 ± 0.50 | 2.87 ± 0.57 | 1.4 |
| Fuji-D | 3.5* | 32 | 30 | 1.49 ± 0.28 | 1.55 ± 0.31 | -3.9 |
| Fuji-D | 4.5* | 45 | 32 | 2.24 ± 0.43 | 2.20 ± 0.44 | 1.8 |
| Fuji-D | 5.5* | 63 | 34 | 3.35 ± 0.61 | 3.22 ± 0.64 | 4.0 |
| Fuji-D | 6.5* | 71 | 35 | 3.69 ± 0.65 | 3.56 ± 0.71 | 3.7 |
Data for 2ABD and AGD 100% glandularity are presented as mean ± standard deviation. The comparison was carried out by considering all mammographic devices. The exposure parameters were chosen as close as possible to the corresponding automatic exposure control settings for a given phantom thickness. For the AGD calculation by the Dance method, the measured air kerma was employed. For the Amulet Innovality devices both the standard acquisition mode and high-resolution acquisition mode (*) were employed