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. 2009 Oct;30(9):1704–1708. doi: 10.3174/ajnr.A1676

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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.