Table 5.
Comparison between individual kV
| CL | QUANT | TECH | ||||
| Protocol group | kV | p -value | kV | p -value | kV | p -value |
| 21 × 19 cm HD | 85–90 | 0.96 | 85–90 | 0.001 | 85–90 | 0.99 |
| 21 × 19 cm HD | 85– 95 | 0.45 | 85–95 | 0.001 | 85–95 | 0.99 |
| 21 × 19 cm HD | 85–100 | 0.73 | 85–100 | 0.001 | 85–100 | 0.98 |
| 21 × 19 cm HD | 85–105 | 0.68 | 85–105 | 0.001 | 85– 105 | 0.92 |
| 21 × 19 cm HD | 85–110 | 0.27 | 85– 110 | 0.001* | 85–110 | 0.93 |
| 21 × 19 cm HD | 90– 95 | 0.46 | 90–95 | 0.46 | 90–95 | 0.99 |
| 21 × 19 cm HD | 90–100 | 0.68 | 90–100 | 0.15 | 90–100 | 0.98 |
| 21 × 19 cm HD | 90–105 | 0.70 | 90–105 | 0.20 | 90– 105 | 0.92 |
| 21 × 19 cm HD | 90–110 | 0.22 | 90– 110 | 0.02* | 90–110 | 0.93 |
| 21 × 19 cm HD | 95– 100 | 0.24 | 95–100 | 0.50 | 95–100 | 0.98 |
| 21 × 19 cm HD | 95– 105 | 0.73 | 95–105 | 0.60 | 95– 105 | 0.92 |
| 21 × 19 cm HD | 95– 110 | 0.03* | 95– 110 | 0.14 | 95–110 | 0.92 |
| 21 × 19 cm HD | 100–105 | 0.43 | 100–105 | 0.87 | 100– 105 | 0.94 |
| 21 × 19 cm HD | 100–110 | 0.44 | 100– 110 | 0.44 | 100–110 | 0.95 |
| 21 × 19 cm HD | 105–110 | 0.10 | 105– 110 | 0.35 | 105– 110 | 0.99 |
| 21 × 19 cm LD | 75–80 | 0.92 | 75–80 | 0.41 | 75–80 | 0.98 |
| 21 × 19 cm LD | 75–85 | 0.43 | 75–85 | 0.02 | 75–85 | 0.95 |
| 21 × 19 cm LD | 75– 90 | 0.70 | 75–90 | 0.01 | 75–90 | 0.97 |
| 21 × 19 cm LD | 75–95 | 0.98 | 75– 95 | 0.001* | 75– 95 | 0.84 |
| 21 × 19 cm LD | 80–85 | 0.49 | 80–85 | 0.11 | 80–85 | 0.98 |
| 21 × 19 cm LD | 80– 90 | 0.63 | 80–90 | 0.11 | 80–90 | 0.95 |
| 21 × 19 cm LD | 80–95 | 0.95 | 80– 95 | 0.01* | 80– 95 | 0.81 |
| 21 × 19 cm LD | 85– 90 | 0.24 | 85–90 | 0.81 | 85–90 | 0.92 |
| 21 × 19 cm LD | 85–95 | 0.47 | 85–95 | 0.23 | 85– 95 | 0.79 |
| 21 × 19 cm LD | 90– 95 | 0.69 | 90– 95 | 0.14 | 90– 95 | 0.86 |
| 12 × 9 cm HD | 85–90 | 0.64 | 85–90 | 0.88 | 85– 90 | 0.97 |
| 12 × 9 cm HD | 85–95 | 0.12 | 85–95 | 0.45 | 85– 95 | 0.96 |
| 12 × 9 cm HD | 85– 100 | 0.04* | 85–100 | 0.06 | 85– 100 | 0.92 |
| 12 × 9 cm HD | 85–105 | 0.25 | 85–105 | 0.06 | 85– 105 | 0.98 |
| 12 × 9 cm HD | 85–110 | 0.18 | 85– 110 | 0.05 | 85– 110 | 0.96 |
| 12 × 9 cm HD | 90–95 | 0.27 | 90–95 | 0.51 | 90–95 | 0.99 |
| 12 × 9 cm HD | 90– 100 | 0.12 | 90–100 | 0.06 | 90–100 | 0.95 |
| 12 × 9 cm HD | 90–105 | 0.52 | 90–105 | 0.06 | 90–105 | 0.99 |
| 12 × 9 cm HD | 90–110 | 0.40 | 90– 110 | 0.05 | 90–110 | 0.98 |
| 12 × 9 cm HD | 95– 100 | 0.72 | 95–100 | 0.30 | 95–100 | 0.96 |
| 12 × 9 cm HD | 95–105 | 0.56 | 95–105 | 0.32 | 95–105 | 0.97 |
| 12 × 9 cm HD | 95–110 | 0.67 | 95– 110 | 0.28 | 95–110 | 0.99 |
| 12 × 9 cm HD | 100– 105 | 0.29 | 100–105 | 0.94 | 100–105 | 0.94 |
| 12 × 9 cm HD | 100– 110 | 0.36 | 100– 110 | 0.98 | 100–110 | 0.96 |
| 12 × 9 cm HD | 105–110 | 0.85 | 105– 110 | 0.91 | 105–110 | 0.97 |
| 12 × 9 cm LD | 75– 80 | 0.62 | 75–80 | 0.93 | 75–80 | 0.95 |
| 12 × 9 cm LD | 75– 85 | 0.88 | 75–85 | 0.54 | 75–85 | 0.99 |
| 12 × 9 cm LD | 75– 90 | 0.50 | 75–90 | 0.42 | 75–90 | 0.94 |
| 12 × 9 cm LD | 75– 95 | 0.74 | 75– 95 | 0.33 | 75– 95 | 0.90 |
| 12 × 9 cm LD | 80–85 | 0.69 | 80–85 | 0.49 | 80–85 | 0.95 |
| 12 × 9 cm LD | 80–90 | 0.82 | 80–90 | 0.39 | 80–90 | 0.99 |
| 12 × 9 cm LD | 80–95 | 0.87 | 80– 95 | 0.29 | 80– 95 | 0.95 |
| 12 × 9 cm LD | 85–90 | 0.54 | 85–90 | 0.75 | 85–90 | 0.94 |
| 12 × 9 cm LD | 85–95 | 0.83 | 85– 95 | 0.64 | 85– 95 | 0.90 |
| 12 × 9 cm LD | 90–95 | 0.71 | 90– 95 | 0.92 | 90– 95 | 0.96 |
CL, clinical; HD, high-dose; LD, low-dose; QUANT, quantitative; TECH, technical; kV, kilovoltage.
Bootstrapping statistical approach. Bolded numbers are comparisons between the best kV from score graphs and other kV values at the same protocol. (*) means statistical difference, p < 0.05.