For all cervical spine views except the Fuchs projection, the chin of the patient should be elevated until the acanthameatal line is perpendicular to the film. For lateral views, the extension can be increased until the occiput and the chin are parallel to the film. It is equally important to check the interpupillary line on the lateral views to make sure that it is also perpendicular to the film. The lateral views should always have the tube perpendicular to the film. While there should be no exposure to the patient's gonads from cervical spine radiography, the lead apron is used primarily for patient reassurance. The upper border for collimation for the lateral view is the EAM. Posterior oblique can be quickly incorporated into the routine cervical spine study because the same tube angulation as the A-P lower cervical spine view is used.