Fracture, mastoiditis, tumor
Mastoid process, mastoid air cells
Ask the patient to lie in prone position.
Place the patient’s head in true lateral position.
The inter-orbital line lies at right angle with the cassette.
The auricle of the ear near the film is folded forward.
Size: 8’’x10’’ Orientation: Landscape
The central ray is directed at an angle of 30° towards the feet. The central ray enters the skull above the ear at parietal region and passes through external auditory meatus proximal to film.
Include all structures of temporal bone around mastoid process.