Article Figures & Data
Figures
- Fig 1.
The TS-IOP and TS-EOP lines in the midsagittal T1-weighted image. A, The TS-IOP line (dashed line) connects the tuberculum sellae (straight arrow) and the internal occipital protuberance (dashed arrow). The straight line represents the ACPC line that connects the anterior commissure and the posterior commissure. B, As shown in A, the TS-EOP line (dashed line) connects the tuberculum sellae (straight arrow) and the external occipital protuberance (dashed arrow). The TS-IOP and TS-EOP lines run nearly parallel to the ACPC line.
- Fig 2.
A, Measurement of the angle between the TS-OP line and the hard palate in the lateral scout view of the brain CT (black arrow). B, Measurement of the angle formed by the ACPC line and the hard palate (white arrow) to calculate the angle difference between the TS-OP line and the ACPC line in the midsagittal T1-weighted brain MR image.
- Fig 3.
A, Scout topography of OML-based brain CT. B, Brain CT images based on the OML showing only the posterior commissure (black arrow) without inclusion of anterior commissure at the level similar to D. C, Scout topography of TS-OP line-based brain CT showing the scanning reference lines parallel to the line connecting the tuberculum sellae and external occipital protuberance. D, Brain CT image based on the TS-OP line showing both the anterior commissure (white arrow) and posterior commissure (black arrow) at the same level B.
Tables
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)
