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Characteristics of the polychromatic x-rays used in this study.
| Filter material and thickness (mm) | |||||
|---|---|---|---|---|---|
| Maximum Energy (kVp) | Tin | Copper | Aluminum | HVL (mm) | Mean Energy (keV) |
| 50 | - | - | 1 | 0.9 Al | 28.5 |
| 100 | - | - | 1.65 | 2.3 Al | 45.6 |
| 150 | - | - | 2.4 | 4.4 Al | 57.9 |
| 200 | - | 0.45 | 1 | 1.0 Cu | 85.8 |
| 200 | 0.4 | 0.25 | 1.02 | 1.9 Cu | 108 |
| 250 | 0.8 | 0.25 | 1.02 | 3.1 Cu | 140 |
