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Table 3
Typical HVL measurements for different combinations of tube voltage and anode/filter combination / s-factors for clinically used spectra (Dance et al., 2000,).
| HVL (mm Al) for anode/filter combination | |||||||
|---|---|---|---|---|---|---|---|
| kV | Mo Mo | Mo Rh | Rh Rh | W Rh | W Ag | W Al (0.5mm) | W Al (0.7mm) |
| 25 | 0.32 ±.02 | 0.38 ±.02 | 0.37 ±.02 | 0.50 ±.03 | 0.51 ±.03 | 0.34 ±.03 | 0.42 ±.03 |
| 28 | 0.35 ±.02 | 0.42 ±.02 | 0.42 ±.02 | 0.53 ±.03 | 0.58 ±.03 | 0.39 ±.03 | 0.49 ±.03 |
| 31 | 0.38 ±.02 | 0.45 ±.02 | 0.45 ±.02 | 0.56 ±.03 | 0.61 ±.03 | 0.44 ±.03 | 0.55 ±.03 |
| 34 | 0.40 ±.02 | 0.47 ±.02 | 0.47 ±.02 | 0.59 ±.03 | 0.64 ±.03 | 0.49 ±.03 | 0.61 ±.03 |
| 37 | 0.62 ±.03 | 0.67 ±.03 | 0.53 ±.03 | 0.66 ±.03 | |||
| Target material | Filter material | Filter thickness (μm) | S-Factor |
|---|---|---|---|
| Mo | Mo | 30 | 1.000 |
| Mo | Rh | 25 | 1.017 |
| Rh | Rh | 25 | 1.061 |
| W | Rh | 50-60 | 1.042 |
| W | Ag | 50-75 | 1.042 |
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