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sinus posit comp
sinus positioning for comp
Question | Answer |
---|---|
Lateral sinuses positioning | IPL perpendicular, MSP and IOML parallel to IR |
CR entry lateral sinuses | perpendicular entering ½” to 1” posterior to outer canthus |
Eval criteria lateral sinuses | superimposed orbital roofs, superimposed mandibular rami, sella turcica in profile. |
Pt. position for Caldwell for sinuses | nose and forehead on bucky |
CR entry Caldwell for sinuses | OML 15 degrees to IR, CR exits nasion |
Alternate name for Caldwell | PA axial |
Structures shown on Caldwell sinuses | frontal, ethmoid and sphenoidal sinuses. |
Eval criteria Caldwell sinuses | petrous ridges in lower 1/3 of orbit, no rotation |
Where should the frontal sinuses be projected on a Caldwell? | above the frontonasal suture |
Where should the anterior ethmoid air cells be projected on a Caldwell? | on each side of the nasal fossae |
Where should the sphenoidal sinuses be projected on a Caldwell? | through the nasal fossae |
Where are the sphenoid sinuses located in relation to the other sinuses? | middle and posterior |
Where are the ethmoidal air cells located in relation to the other sinuses? | middle and anterior |
Where are the maxillary sinuses located in relation to the other sinuses? | directly inferior to the ethmoid |
Approximate technique for lateral sinuses? | 70 at 8 |
Approximate technique for waters | 75 at 28 |