Table 3.
Breakdown of the CT/MRI fiducial point registration discrepancy (mm)
| Within-subject |
Between-subjects |
|||
|---|---|---|---|---|
| mean | (max) | mean | (max) | |
| All possible fiducial points | 4.2 | (7.5) | 5.9 | (10.7) |
| Individual fiducial points | ||||
| Nose tip | 2.8 | (2.8) | 3.3 | (3.9) |
| Nasion | 3.7 (7.6) | 4.7 | (7.0) | |
| Globes | 3.0 | (5.9) | 7.0 | (12.2) |
| Optic chiasm | 2.5 | (4.4) | 3.4 | (4.4) |
| Cella | 3.8 (6.1) | 4.8 | (9.2) | |
| Tympanic membranes | ||||
| Pre-auricular fossae | 4.3 (6.0) | 7.0 | (11.2) | |
| Foramen magnum | 6.4 (8.3) | 8.1 | (12.1) | |
| Inion | 5.4 (9.3) | 8.2 | (10.8) | |
| Subset of best fiducial points | 3.1 | (5.0) | 3.2 | (4.8) |