Chapter 23

Lateral jaw projection-body of the mandible:

Receptor placement: Flat against cheek, centered over body of the mandible.
Head position: Tipped aprox. 15 degrees towards side being imaged. Chin is extended and elevated slightly.
Beam alignment: Upwards (-15 to -20 degrees).

Lateral jaw projection-ramus of the mandible:

Receptor placement: Centered parallel over ramus.
Head position: Tipped aprox. 15 degrees toward side being imaged. Chin elevated slightly.
Beam alignment: Upward (-15 to-20 degrees).

Lateral cephalometric Projection:

Receptor placement: Cassette placed perpendicular to floor in holding device. Long axis of cassette is positioned horizontally.
Head position: Left side of patients head is adjacent to cassette.
Beam alignment: Central ray is through center of cassette an

Posterior projection:

Receptor placement: Long axis of cassette is positioned vertically.
Head position: Forehead and nose touch cassette.
Beam alignment: Central ray is directed through center of head, perpendicular to to cassette.

Waters Projection:

Receptor placement: long asia of cassette is positioned vertically.
Head position: Chin touches cassette, tip of nose positioned 1/2 to 1 inch away from cassette.
Beam alignment: Central ray directed through center of head and perpendicular to cassette.

Submentovortex projection:

Receptor placement: Cassette positioned perpendicular to the floor in cassette holding device.
Head position: head and neck are tipped back as far as possible.
Beam alignment: Central ray directed through center of head and perpendicular to cassette.

Reverse Towne projection:

Receptor placement: Long axis of cassette is positioned vertically.
Head position: tipped down and mouth opened as wide as possible, chin rests on chest, top of forehead touches the cassette.
Beam alignment: center of head perpendicular to cassette.

Transcranial projection:

Receptor placement: centered over tmj flat against ear.
Head position: Midsagital plane must be aligned perpendicular to the floor and parallel to the cassette.
Beam alignment: 2 inches above and 0.5 inches behind the opening of ear canal downward (+25 de

Which projection is best for examination of the maxillary sinus?

the Waters projection.

Which projection is best for the examination of fractures of the zygomatic arch?

Submentovertex projection.

Which projection is best for examination of fractures of the condylar neck?

Reverse Towne projection.

Which projection is best for examination of soft tissue profile of the face?

lateral cephalometric projection.

Which projection is best for examination of the condyle and articular eminence?

Transcranial projection (Lindblom technique).

Which projection is best for examination of a large lesion in the ramus?

Lateral jaw imaging- rams of mandible.