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(a) The orbito-meatal (OM) line (dotted arrow) is used for positioning of Waters’ view (solid arrow). The angle from the OM line is 45 degrees. (b) The illustration of the midsagittal image shows that the landmarks are the center of the mammillary body (solid arrow) and the most posterior point of the cerebellar tentorium (dotted arrow). (c) On the axial image obtained by using these landmarks, the lens (arrow) and the external auditory meatus (arrowhead) are shown.
