Table 3.
Normative orbital measurements on T1-weighted MRI
| Measurement | Plane | Total (mean ± SD in mm) | Male (mean ± SD in mm) | Female (mean ± SD in mm) | P-value |
|---|---|---|---|---|---|
| LR | Axial | 3.44 ± 0.61 | 3.61 ± 0.53 | 3.30 ± 0.65 | 0.02 |
| MR | Axial | 4.12 ± 0.52 | 4.11 ± 0.50 | 4.12 ± 0.55 | 0.93 |
| MR | Coronal | 4.01 ± 0.53 | 4.04 ± 0.53 | 3.98 ± 0.53 | 0.63 |
| SMG | Coronal | 4.29 ± 0.67 | 4.36 ± 0.59 | 4.23 ± 0.74 | 0.39 |
| IR | Coronal | 4.62 ± 0.73 | 4.68 ± 0.73 | 4.57 ± 0.73 | 0.48 |
| ONSD | Coronal | 5.72 ± 0.85 | 5.79 ± 0.98 | 5.75 ± 0.74 | 0.84 |
| SOV | Coronal | 1.96 ± 0.71 | 1.92 ± 0.67 | 2.00 ± 0.75 | 0.59 |
| Sum of muscles | Axial, coronal | 16.5 ± 1.73 | 16.8 ± 1.53 | 16.2 ± 1.88 | 0.15 |
LR lateral rectus, MR medial rectus, SMG superior muscle group, IR inferior rectus, ONSD optic nerve sheath diameter, SOV superior ophthalmic vein