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Skull Positioning
Orbits
| Question | Answer |
|---|---|
| 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
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