No. of X-ray image | Entrance dose change [%] | Tube current–time product [mAs] | Tube voltage change [kVp] | P-value from paired t-test | Protocol |
---|---|---|---|---|---|
2 | 0 | 6.3 | 0 | 0.185 | A |
3 | − 21 | 5 | 0 | < 0.001 | A |
4 | − 37 | 4 | 0 | < 0.001 | A |
5 | − 49 | 3.2 | 0 | < 0.001 | A |
6 | + 27 | 8 | 0 | 0.678 | A |
7 | + 39 | 6.3 | + 3 | < 0.001 | A |
8 | − 31 | 6.3 | − 3 | 0.012 | A |
9 | − 48 | 6.3 | − 5 | 0.002 | A |
10 | − 68 | 6.3 | − 8 | 0.038 | A |
11 | 0 | 6.3 | 0 | 0.013 | B |
12 | 0 | 6.3 | 0 | 0.024 | C |