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Skull Positioning

Orbits

QuestionAnswer
What are the projections done for orbits? Waters, Lateral of affected side, PA Axial, Rhese PA bilateral
In the Waters orbits, the OML is perpendicular and the MML forms a 37 degree angle to the table. T or F False, the MML is perpendicular and te OML forms a 37 degree angle to the IR
What is the main reason for doing a Waters with the orbits? To see a blow out fracture
Describe the patients position in the Waters orbits? Patient is prone or upright, chin in table
Central ray is _______ and exits the _______ in the Waters orbits. Perpendicular; acanthion
In the Waters orbits the petrous ridges are located where? Located below the maxillary sinuses
In the Lateral orbits, which side do we do? We do the affected side
Describe patients position and positioning lines used in Lateral orbits projection. Pt. is semi-prone with affected side against film; IPL perpendicular, MSP paralle, IOML parallel
In the Lateral orbits the central ray is ______. perpendicular through the outer canthus of the affected side
What is demonstrated in the Lateral orbits? Orbital roofs superimposed
PA axial orbits: Describe central ray direction and exit or entrance point. Central ray is angled 20-25 degrees caudal (30 degrees merrils) and exits at the level of the inferior margin of the orbit
Describe patients position for the PA axial orbits. patient is prone or upright, Forehead and nose resting on table, OML perpendicular, MSP perpendicular
In the PA axial orbits the petrous ridges are located ______. below the superior orbital fissures
What is most importantly demonstrated in the PA axial orbits? Orbits free of superimposition by the petrous ridges
Which method is used to demonstrate the optic foramen in inferior lateral corner of orbit side down and outer rim of side up? Rhese PA parieto orbital oblique
In the PA Rhese the patient is prone and the head is rotated so MSP forms a _____ from the IR. 53 degree angle from IR
What is the central ray direction and entrance point in the Rhese PA orbits? perpendicular through the inner canthus side up
In the Waters Orbits, what is demonstrated? petrous ridges below the maxillary sinuses, blowout orbital fractures, no rotation
Created by: sr4095 on 2009-03-03



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