Mean and SD of the angle acquired from the reference lines of the 223 midsagittal brain MR images vs the ACPC line*
| Reference Lines | Angle Difference to the ACPC Line | SD |
|---|---|---|
| TS-EOP line | 0.0° | ±4.0° |
| TS-IOP line | 0.8° | ±3.2° |
| OML | −12.6° | ±4.2° |
Note:—ACPC indicates anterior/posterior commissure; TS-EOP, tuberculum sellae and external occipital protuberance; TS-IOP, tuberculum sellae and internal occipital protuberance; OML, orbitomeatal line.
* P value: .236 (TS-EOP line vs TS-IOP line), 0 (TS-EOP line vs OML and TS-IOP line vs OML)