Serial axial slice showing measurement of the maxillary sinus dimensions:
anteroposterior (AP) and mediolateral (ML) measures were performed at 5, 10, 15 and 20 mm above the most apical level of the maxillary sinus floor.
Shahbazian M, Xue D, Hu Y, Cleynenbreugel J, Jacobs R.
J Oral Maxillofac Res 2010 (Jan-Mar);1(1):e7. doi:10.5037/jomr.2010.1107