Skull Radiographic Views & Anatomy Flashcards
Main types of skull radiographs?
Occipitomental
PA Mandible
Reverse Towne’s
True lateral skull
Occipitomental
midface (middle third)
PA mandible
posterior mandible excluding condyles
Reverse Towne’s
of mandibular condyles
Line used for skull radiograph
Orbitomeatal line/ Canthomeatal line
Orbitomeatal line
Outer canthus of eye
Centre of external auditory meatus
Line used for OPT and Lateral ceph?
Frankfort plane
OM radiograph
avoids superimposition of skull base
0/10/30/40 degrees (used two together)
Waters view
OM indications:
Le Fort 1/2/3
Zygomatic complex
Nasoethmoidal complex
Orbital blow-out
Coronoid process fractures
OM positioning
Face at receptor
Orbitomeatal line is 45* to receptor
PA mandible
Shows posterior parts of mandible
Has superimposition of base of skull
PA Skull if calvarium included
PA mandible indications
Posterior 3rd of body
Angles
Rami
Low condylar necks
Mandubular hyper/hypo plasia
Maxillofacial deformities
PA mandible positioning
Face towards receptor and tipped forward
Orbitomeatal line is parallel to the floor
Beam is is perpendicular to receptor
Why x-ray beam is projected from posterior side?
Reduced magnification of the face
Reduced effective dose (lower dose to radiosensitive tissues eg. eyes)
Reverse Towne’s
Shows condylar head and neck
Similar to PA mandible but mouth open and different beam angle
