Projections (views) for IAMM

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Presentation transcript:

Projections (views) for IAMM Per-orbital view – (Occipito-Frontal) Towne’s view Stenverse projections – 450 PA obliques with beam angled 120 cephalad

Per-Orbital View - IAM True AP or PA Central ray passes in midline along the Orbito-meatal plane Increase kV to penetrate the dense petrous part IAM

Towne’s - IAMM

Stenvers Projection - Petromastoid Head rests on the forehead, nose and cheek IOML parallel to upper edge of bucky Midsagittal plane at 450 to the bucky Central ray, angled 120 cephalad, enters 7-10 cm posterior an 1.5 cm inferior to the EAM remote from film

Stenver’s projection Demonstrates Petrous ridge Cellular structure of the mastoid process Mastoid antrum The area of the tympanic cavity Bony labyrinth Internal acoustic canal Cellular stucture of the petrous apex

Mastoids Fronto-Occipital 350 Lateral with 250 caudal beam angulation Lateral with 150 facial and 150 caudal tube angulation (Modified Law’s projection)

Mastoids – Modified law’s Head lateral IOML parallel to upper edge of cassette Rotate head towards face to bring mi sagittal plane is angled 150 Central ray, angled 150, caudad, enters 5cm posterior to and 5cm superior to EAM remote from film

Mastoids – Modified law’s Criteria Mastoid process closest to Film, with air cells centered to film Opposite mastoid process lying inferior and slightly anterior Auricle of ear not superimposing TMJ visible anterior to mastoid