Table 2.
Measured values of Inner Perimeter and Wall Thickness at several fields of view.
| Tube | Reference value (mm) | Measured value, Phase Congruency method | |||
|---|---|---|---|---|---|
| FOV=100 mm | FOV=150 mm | FOV=200 mm | FOV=350 mm | ||
| Inner Perimeter (Pi) in mm | |||||
| 1 | 9.42 | 8.36 | 8.37 | 8.28 | 7.97 |
| 2 | 18.85 | 18.44 | 18.33 | 18.33 | 18.39 |
| 4 | 18.85 | 19.22 | 19.48 | 19.46 | 19.39 |
| Wall Thickness (WT) in mm | |||||
| 1 | 0.60 | 0.99 | 0.98 | 1.01 | 1.05 |
| 2 | 0.90 | 1.15 | 1.14 | 1.14 | 1.12 |
| 4 | 1.50 | 1.41 | 1.42 | 1.42 | 1.33 |
| Reference Wall Thickness in pixels | |||||
| 1 | 3.13 | 2.05 | 1.54 | 0.88 | |
| 2 | 4.69 | 3.07 | 2.30 | 1.32 | |
| 4 | 7.82 | 5.12 | 3.84 | 2.19 | |