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Projections (views) for IAMM

Projections (views) for IAMM. Per-orbital view – (Occipito-Frontal) Towne’s view Stenverse projections – 45 0 PA obliques with beam angled 12 0 cephalad. Per-Orbital View - IAM. True AP or PA Central ray passes in midline along the Orbito-meatal plane

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Projections (views) for IAMM

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

  2. 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

  3. Towne’s - IAMM

  4. 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

  5. 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

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

  7. 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

  8. 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

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