Skull Positioning Matching
| What are the projections done for orbits? |
| Waters, Lateral of affected side, PA Axial, Rhese PA bilateral |
| In the Waters orbits the petrous ridges are located where? |
| Located below the maxillary sinuses |
| Describe the patients position in the Waters orbits? |
| Patient is prone or upright, chin in table |
| Describe patients position for the PA axial orbits. |
| patient is prone or upright, Forehead and nose resting on table, OML perpendicular, MSP perpendicular |
| What is the main reason for doing a Waters with the orbits? |
| To see a blow out fracture |
| In the Waters Orbits, what is demonstrated? |
| petrous ridges below the maxillary sinuses, blowout orbital fractures, no rotation |
| 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 and positioning lines used in Lateral orbits projection. |
| Pt. is semi-prone with affected side against film; IPL perpendicular, MSP paralle, IOML parallel |
| 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 |
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