Orbits/Nasal Bones Procedures

what is auroras routine for orbits

30* caldwell, waters, affected side lateral

why is PA not usually done for orbits

petrous ridges fill orbits in PA

explain patient position and CR for Caldwell (orbits)

pt erect or recumbent

OML perpendicular, MSP perpendicular

CR 30* Caudal exiting at nasion

what is demonstrated in Caldwell for orbits

petrous ridges slightly below orbital floor

superior orbital fissures

fractures, foreign bodies

explain pt position and CR for parieto-acanthial (waters view-orbits)

MML perpendicular to IR, OML forms 37* angle to IR, MSP perpendicular to IR

CR perpendicular to IR, exiting at the acanthion

what is demonstrated in parieto-acanthial (waters view-orbits)

petrous ridges below maxillary sinus

entire orbital floor

fractures (blowout fx), foreign body (pre-MRI)

explain PT position and CR for lateral orbits

affected side against IR

MSP parallel to IR, IP line perpendicular to IR

CR perpendicular to IR entering at outer canthus

explain what is demonstrated in lateral orbits

lateral view of bony orbit and soft tissue

fractures, foreign bodies

who would Pre-MRI orbits be ordered for

anyone with history of working with metal or having metal in eye, Welders**

what is Aurora’s routine for pre-MRI orbits

2 views - Waters, Lateral

what orbital views are useful in demonstrating foreign bodies

caldwell, lateral, and waters

what degree do the optic foramen lie in reference to MSP and OML

MSP-37*

OML-30*

explain pt position and CR for parieto-orbital (Rhese method-Orbits)

pt position - 3 point landing (cheek, chin, and nose resting on IR) - MSP forms 53* angle to IR

AML perpendicular to IR (overextended-canal too low, overflexed-canal too high)

Central Ray: perpendicular, entering 1” superior and 1” posterior to upside TEA

what is demonstrated in the Rhese View for orbits

frontal view of optic canal lying in lower outer quadrant of downside orbit

where will optic canal lie if MSP is less than 53* (greater rotation)

more lateral

where will optic canal lie if MSP is more than 53* (less rotation)

more medial

what is aurora’s routine for nasal bones

PA, waters, both laterals

explain pt position and CR for PA nasal bones

OML and MSP perpendicular

CR perpendicular exiting at nasion

what is demonstrated in PA nasal bones

petrous ridges filling orbits, frontal bone, crista galli, nasal bones, septum, posterior ethmoids, frontal sinuses, fractures

explain pt position and CR for parietoacanthial (waters view) for nasal bones

MSP perpendicular to IR, MML perpendicular to IR, OML forms 37* angle with IR

CR perpendicular to IR exiting at acanthion

what is demonstrated in parietoacanthial projection (waters view) for nasal bones

petrous ridges just below maxillary sinuses, orbits, zygomas, deviated nasal septum seen, fractures

what makes up the nasal septum

perpendicular plate of ethmoid, vomer

explain pt position and CR for lateral nasal bones

pt body obliqued, head turned lateral, MSP parallel, IOML parallel to floor, IP line perpendicular to IR

CR perpendicular entering 1/2” inferior and 1” posterior to nasion

what about the equipment needs to be changed for lateral nasal bones

NON GRID & SMALL FOCAL SPOT SIZE

what will be demonstrated on lateral nasal bones

lateral view of nasal bones and soft tissue, fractures

nasofrontal suture and anterior nasal spine

what S# and Ei# are appropriate for orbits and nasal bones

200-600

what average techniques should be used for Orbits (Caldwell, Waters, Lateral)

Caldwell - 80 @ 8-10

Waters - 80 @ 10-12

Lateral - 80 @ 3.2-4

what average techniques should be used for nasal bones (PA, Waters, both laterals)

PA - 80 @ 8-10

Waters - 80 @ 10-12

Laterals (non-grid) - 60 @ .8-1