Description of discordant scans and imaging techniques by institution
| Center | Total scans | Discordant scans, n (%) | Discordant scans requiring intervention, n (%) | Imaging technique |
| 1 | 59 | 15 (25) | 5 (8.4) | Steep reconstruction plane roughly parallel to the orbital roof, ending above the C1 arch. |
| 2 | 53 | 10 (19) | 2 (3.8) | Steep reconstruction plane roughly parallel to the orbital roof, ending above the C1 arch. |
| 3 | 40 | 5 (12.5) | 0 (0) | Steep reconstruction plane roughly parallel to the orbital roof, ending above the C1 arch. |
| 4 | 69 | 5 (7.3) | 0 (0) | Steep reconstruction plane roughly parallel to the orbital roof, including the C1 arch. |
| 5 | 101 | 0 (0) | 0 (0) | The fifth center routinely scanned head and face in the trauma setting and used a reconstruction plane closer to the more horizontal orbitomeatal plane. |