FIG 1. Definition of the midsagittal plane. For the coronal images: x indicates left to right; y, posterior to anterior; and z, inferior to superior.

A, Coronal image through the AC (left), axial image through the PC (middle), and sagittal image of the AC-PC line before the first rotation (right).

B, AC-PC line orthogonal to the image cuboid.

C, Coronal image demonstrating the AC-IF line.

D, Sagittal image through the midsagittal plane after the final rotation.