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