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Dedicated breast computed tomography systems used in this study along with the corresponding x-ray beam characteristics.
| Scanner | kV | Filtration | 1st HVL (mm AL) | Effective energy (keV) | Theoretical 100% adipose tissue HU |
|---|---|---|---|---|---|
| Albion | 80 | 0.30 mm Cu | 5.7 | 45 | −89 |
| Bodega | 80 | 0.20 mm Cu | 5.0 | 42 | −110 |
| Cambria | 65 | 0.25 mm Cu | 4.0 | 39 | −128 |
| Doheny | 60 | 0.20 mm Gd | 3.6 | 36 | −151 |
