Table 1 Exposure parameters of the 3 scanners used in this study.
From: Low-cost dual-energy CBCT by spectral filtration of a dual focal spot X-ray source
DE-CBCT | CBCT-1 | CBCT-N | ||
---|---|---|---|---|
LE | HE | |||
Tube voltage (kVp) | 110 | 110 | 110 | 110 |
Filtration | 0.15 mm Ta | 0.5 mm Sn | 0.3 mm Cu | 6 mm Al |
Mean energy (keV) | 60.4 | 75.9 | 62.2 | 56.7 |
Tube current(mA) | 15 | 15 | 11 | 5 |
Δtexp (ms) | 5.0 | 5.0 | 5.0 | 6.5 |
Number of projections | 360 | 360 | 360 | |
Total exposure (mGy) | 2.37 | 1.42 | 3.94 | 3.78 |
DAP (mGy × cm2) | 309.6 | 185.7 | 517 | 1090 |
HVL (mm Al)* | 8.5 | 10.8 | 8.2 | 5.8 |
Field of view | 187 mm (w) × 70 mm (h) | 187 mm (w) × 70 mm (h) | 180 mm (w) × 160 mm (h) |