Skull Positioning ElLEN QUIZ

• - Position: AP
• - Landmark: Orbital Meatal Line perpendicular to Image Receptor

• - Position: AP
• - Landmark: Infraorbital Meatal Line is perpendicular to IR.

• - Central Ray: 2.5 inches above the Globella.
• - Angle: 30 degrees Caudad
• - Angle: 37 derees Caudad

Dorsum salae and psterior clinoid in shadows of Foramen Magnum

• - Position: Lateral
• - Landmark: Midsagital Plane Parallel to IR. Interpupillary line perpendicular to the IR.

It is centered two inches above External Acoustic Meatus.

• For a lateral skull you see:
• - Sella turcica
• - Anterior and posterior clinoids.
• - Dorsum Sallae.

• - Position: PA axial
• - Landmark: Orbital Meatal Line perpendicular to IR.

• - 15 degree caudal Angle exiting at nasion.
• - 25-30 degrees caudal angle exiting at nasion.

You see the petrous pyramids at 1/3 lower part of the superior orbital margin. When you angle more, it brings the petrous pyramids down out of the way to see the orbits.

• - Position: PA
• - Landmark: Orbital Meatal Line is perpendicular to IR.

- Central Ray exiting at Globella.

The petrous pyramids fill the orbits and you see the posterior and anterior clinoids superior to the ethmoid sinuses.

• - Position: AP
• - Landmark: Infraorbital Metal Line is parallel to IR.

- Centering is midway between Gonion.

You see the mandibular condyles projected anterior to the petrous ridges.

• - Positioning: PA
• - Landmark: Orbital Meatal Line perpendicular to the IR

Angle 25 degrees at midsagital plane at the level of EAM exiting 1 and 1/2 inch superior to the nasion.

Dorsum Sale in foramen magnum ( Same as Townes Method )