| Benchmarks | Number | Percentage (%) |
| Axial plane |
|
|
| - Yes | 44 | 100.0 |
| - No | 00 | 00.0 |
| Symmetrical cut |
|
|
| - Yes | 20 | 45.4 |
| - No | 24 | 54.6 |
| Thalami and v3 visible |
|
|
| - Yes | 15 | 34.1 |
| - No | 29 | 65.9 |
| The 3 landmarks |
|
|
| - Yes | 10 | 22.7 |
| - No | 34 | 77.3 |