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Table 1 Comparison between measured and calculated (Eq. (2)) incident air kerma for the reference Hologic Selenia Dimensions (device A)

From: Average absorbed breast dose (2ABD): an easy radiation dose index for digital breast tomosynthesis

Phantom thickness (cm)Tube load (mAs)Tube voltage (kVp)Measured air kerma (mGy)Calculated air kerma (mGy)Relative difference (%)
2.037.5262.11 ± 0.082.06 ± 0.15-2.6
2.540272.61 ± 0.102.54 ± 0.19-2.8
3.037.5282.74 ± 0.112.71 ± 0.20-1.3
3.540293.33 ± 0.133.24 ± 0.24-2.7
4.050294.14 ± 0.174.12 ± 0.31-0.4
4.550304.66 ± 0.194.59 ± 0.34-1.6
5.055315.80 ± 0.235.60 ± 0.42-3.6
5.560327.08 ± 0.286.73 ± 0.50-5.3
6.065338.18 ± 0.337.99 ± 0.59-2.4
6.570349.78 ± 0.399.40 ± 0.70-4.1
7.0803512.03 ± 0.4811.69 ± 0.87-2.9
7.5803613.02 ± 0.5212.68 ± 0.94-2.7
8.5803815.19 ± 0.6114.78 ± 1.10-2.8
8.5904221.52 ± 0.8620.55 ± 1.53-4.7
  1. Data for measured air kerma and calculated air kerma are presented as mean ± standard deviation. Note that the exposure parameters were chosen as close as possible to the corresponding automatic exposure control settings for a given phantom thickness