Facial Bones Positioning Flashcards
Whats another name for the PA axial view facial bones?
Caldwell method
Whats another name for the caldwell method facial bones?
PA axial
What structures are seen in a PA axial facial bones (Caldwell method)?
- Orbits are equal distance from the skull borders
- Symmetric petrous ridges lying in the lower /3 of the orbit
- Exaggerated Caldwell= Petrous ridges projected below the inferior margins of orbits
How is the patient positioned for a PA axial facial bones (Caldwell method)?
- Patient is prone or upright (upright is best)
- Forehead and nose rest against the table/bucky
What do you need to check for accuracy for a PA axial facial bones (Caldwell method)?
Baselines
Where is the MSP & OML in a PA axial facial bones (Caldwell method)?
Perpendicular to IR
Where is the CR for a PA axial facial bones (Caldwell method)?
Exits at the nasion
What angle is the CR for a PA axial facial bones (Caldwell method)?
15 degrees caudal
What does the exaggereated caldwell method show?
- Shows the orbital rims
- Petrous ridges are projected below the inferior margins of the orbits
What view shows the orbital rims for facial bones w/ the petrous ridges projected below the inferior margins of the orbits?
Exaggerated caldwell
What angle is the CR for an exaggerated caldwell for facial bones?
30 degrees caudal
What are the structures seen for a parietoacanthial facial bones views (waters method)?
- Distance between the lateral border of the skull and orbit equal on each side
- Petrous ridges below maxillary sinuses
- Demonstrates the maxillae, orbits, and zygomatic arches
- Modified Waters= Petrous ridges projected immediately below the inferior border of the orbits
How is the patient positioned for a parietoacanthial facial bones views (waters method)?
- Patient is prone or PA upright (upright is best)
- Chin on bucky/table
- Nose 3/4” from bucky/table
Where is the CR for a parietoacanthial facial bones views (waters method)?
Exits the acanthion
Where is the OML for a parietoacanthial facial bones views (waters method)?
37 degrees with plane of IR
Where is the MML & MSP for a parietoacanthial facial bones views (waters method)?
Perpendicular to the plane of IR
What does modified waters of the facial bones do the OML?
Places OML 55 degrees with the plane of IR
What structures are seen for a left lateral facial bones view?
- All facial bones in their entirety, with the zygomatic bone in the center
- Almost perfectly superimposed mandibular rami
- Superimposed orbital roofs
- No rotation of sella turcica
Where is the CR for a left lateral facial bones view?
Enters lateral surface of the zygomatic bone halfway between the outer canthus and EAM
How is the patient positioned for a left lateral facial bones view?
- Patient is prone or upright (upright is best) in LAO
- Head in true lateral position
Where is the MSP for a left lateral facial bones view?
Parallel to IR
Where is the IP line for a left lateral facial bones view?
Perpendicular to IR
Where is the IOML for a left lateral facial bones view?
Perpendicular to front edge of IR
Whats another name for the parietoacanthial view of the facial bones?
Waters method
