Revision 8 for 'Anterior commissure - posterior commissure line'All Revisions
The anterior commissure (AC) - posterior commissure (PC) line, also referred as the bicommissural line, has been adopted as a convenient standard by the neuroimaging community, and in most instances is the reference plane for axial imaging in everyday scanning. The use of such line sets a standard image plane and thus makes the comparison among exams.
It is prescribed on midline sagittal images (figure 1), and is similar to the canthomeatal pitch used on CT (based on the scout image), although the AC-PC line is 9 degrees steeper than the canthomeatal pitch 2.
An alternative and less commonly used description of thine proposed by Schaltenbrand draws the line trough the midpoint of both the anterior and posterior commissure, resulting in a slightly shallower angle 1,3.