• Position the patient lying on their back or sitting upright, with the head centered and straight.
• Adjust the midsagittal plane (MSP) so it's aligned vertically and perpendicular to the image receptor.
• Position the orbitomeatal line (OML) perpendicular to the IR surface. If the patient cannot tuck the chin sufficiently, use the infraorbitomeatal line (IOML) instead, adjusting the tube angle accordingly.

Central Ray (CR)

• Angle the x-ray beam 30 degrees downward (caudad) w...