Table 1A.
Inter-observer variability in localization of fiducial points. For most images the average distance (MEAN_HD ± STD_HD) between annotations of fiducial points by two different observers is less than 1 cm. Although for few cases we get higher variation, on inspection of the two annotations visually, they seem to represent the same fiducial point (see Fig. 3B).
| Inter-observer variability for HD pose (mm) | |||||
|---|---|---|---|---|---|
| MEAN_HD | Obs.1-Obs.2 | Obs.1-Obs.3 | Obs.2-Obs.3 | Obs.2-Obs.4 | Obs.1-Obs.4 |
| Nipple left | 4.42 | 3.36 | 5.03 | 4.51 | 3.19 |
| Nipple right | 3.36 | 5.61 | 4.89 | 3.54 | 3.89 |
| Sternal notch | 7.01 | 7.45 | 6.42 | 6.75 | 9.40 |
| STD_HD | |||||
| Nipple left | 2.88 | 3.90 | 3.55 | 3.51 | 3.96 |
| Nipple right | 2.65 | 6.06 | 5.22 | 2.24 | 3.02 |
| Sternal notch | 3.35 | 4.44 | 5.46 | 4.09 | 3.85 |
| MEAN_HD | Obs.1-Obs.5 | Obs.3-Obs.5 | Obs.2-Obs.5 | Obs.4-Obs.5 | Obs.3-Obs.4 |
| Nipple left | 3.26 | 4.81 | 4.14 | 4.85 | 4.67 |
| Nipple right | 3.69 | 6.24 | 3.34 | 4.06 | 6.94 |
| Sternal notch | 8.09 | 7.45 | 6.77 | 8.98 | 11.28‡ |
| STD_HD | |||||
| Nipple left | 2.77 | 3.83 | 3.90 | 4.03 | 5.05 |
| Nipple right | 2.54 | 5.92 | 2.72 | 2.42 | 5.21 |
| Sternal notch | 4.47 | 3.83 | 3.81 | 5.89 | 7.62 |
| MEAN_HD | Obs.6-Obs.1 | Obs.6-Obs.2 | Obs.6-Obs.3 | Obs.6-Obs.5 | Obs.6-Obs.4 |
| Nipple left | 3.60 | 5.19 | 6.50 | 3.92 | 4.91 |
| Nipple right | 3.70 | 4.65 | 5.62 | 5.20 | 5.36 |
| Sternal notch | 8.06 | 4.73 | 8.50 | 8.40 | 8.32 |
| STD_HD | |||||
| Nipple left | 3.49 | 5.38 | 3.72 | 3.06 | 3.84 |
| Nipple right | 4.63 | 4.62 | 6.18 | 3.82 | 4.26 |
| Sternal notch | 4.64 | 3.75 | 5.23 | 4.49 | 4.49 |
Note:
‡
Measurements where the difference between two observers is more than 1 cm.