Table 2.
Volume and surface area measurements for different CBCT voxel sizes with 5 thresholds compared to laser scanning
| Voxel size (mm) | Thresholds (HU) |
Volume | Surface Area | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Mean Vol ± SD(mm3) | Difference ± SD(mm3) | Deviation%(%) | P-value | Mean SA ± SD(mm2) | Difference ± SD(mm2) | Deviation%(%) | P-value | ||
| 0.3 mm | 800 | 593.52 ± 210.91 | 91.31 ± 22.94 | 19.07% | 0.000 | 449.26 ± 113.71 | 32.36 ± 5.44 | 7.78% | 0.000 |
| 1000 | 578.29 ± 207.17 | 76.08 ± 19.37 | 15.88% | 0.000 | 443.13 ± 112.91 | 26.23 ± 4.83 | 6.32% | 0.000 | |
| 1200 | 563.48 ± 203.45 | 61.27 ± 16.07 | 12.78% | 0.000 | 436.97 ± 112.03 | 20.07 ± 4.41 | 4.84% | 0.000 | |
| 1400 | 548.71 ± 199.63 | 46.50 ± 13.26 | 9.70% | 0.000 | 430.79 ± 110.93 | 13.83 ± 4.49 | 3.37% | 0.000 | |
| 1600 | 533.69 ± 196.12 | 31.48 ± 11.55 | 6.54% | 0.000 | 424.31 ± 110.33 | 7.42 ± 4.18 | 1.82% | 0.000 | |
| 0.15 mm | 800 | 555.83 ± 201.18 | 53.62 ± 12.96 | 11.19% | 0.000 | 436.44 ± 112.54 | 19.54 ± 3.39 | 4.70% | 0.000 |
| 1000 | 544.00 ± 198.19 | 41.79 ± 10.12 | 8.71% | 0.000 | 431.51 ± 111.75 | 14.61 ± 2.96 | 3.52% | 0.000 | |
| 1200 | 532.22 ± 195.14 | 30.02 ± 7.53 | 6.25% | 0.000 | 426.58 ± 111.05 | 9.68 ± 2.68 | 2.34% | 0.000 | |
| 1400 | 520.28 ± 191.97 | 18.07 ± 5.58 | 3.76% | 0.000 | 421.53 ± 110.24 | 4.63 ± 2.80 | 1.13% | 0.000 | |
| 1600 | 508.18 ± 188.99 | 5.97 ± 5.72 | 1.22% | 0.000 | 416.08 ± 109.51 | -0.82 ± 3.35 | -0.18% | 0.337 | |
| laser model | 502.21 ± 188.75 | 416.90 ± 110.95 | |||||||
P-value: Mean CBCT model volume/surface area vs. mean laser model volume/surface area