| ROI No. | simCT | rCBCT | mCBCT | |||
| HU | rCBCT value | % difference in REDrCBCT | mCBCT value | % difference in REDmCBCT | ||
| off-center −6.0 cm (superior) | ||||||
| 1 | 15 ± 5 | −116 ± 38 | 4.70% ± 1.77% | −1 ± 1 | −1.13% ± 0.58% | |
| 2 | 41 ± 6 | −77 ± 44 | 4.88% ± 1.67% | 40 ± 21 | −0.05% ± 0.97% | |
| 3 | 513 ± 37 | 507 ± 44 | 3.79% ± 1.37% | 537 ± 43 | 0.93% ± 0.29% | |
| (mean ± 1SD) |
| (4.46% ± 1.49%) |
| (−0.08% ± 1.07%) | ||
| off-center 0.0 cm (center) | ||||||
| 4 | 57 ± 11 | −130 ± 28 | 2.03% ± 0.86% | 51 ± 13 | −0.28% ± 0.67% | |
| 5 | 40 ± 5 | −114 ± 27 | 3.52% ± 1.02% | 25 ± 11 | −0.72% ± 0.76% | |
| 6 | 441 ± 54 | 393 ± 54 | 3.12% ± 1.12% | 465 ± 52 | 0.96% ± 0.25% | |
| (mean ± 1SD) |
|
| (2.89% ± 1.10%) |
| (−0.01% ± 0.92%) | |
| off-center 10.0 cm (inferior) | ||||||
| 7 | 41 ± 5 | −258 ± 11 | −5.96% ± 1.44% | −15 ± 18 | −3.19% ±0.32% | |
| 8 | 38 ± 6 | −260 ± 12 | −6.03% ± 1.54% | 57 ± 9 | 0.95% ± 0.19% | |
| 9 | 176 ± 18 | −133 ± 46 | −3.59% ± 1.19% | 201 ± 11 | 1.16% ± 0.39% | |
| (mean ± 1SD) |
|
| (−5.19% ± 1.71%) |
| (−0.36% ± 2.14%) | |
| Total mean ± 1SD | 0.72% ± 4.53% |
| −0.15% ± 1.43% | |||