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skull posit comp

skull positioning for comp

QuestionAnswer
Lateral skull positioning MSP parallel, IOML parallel to long axis of IR, IPL perpendicular to IR.
CR entry lateral skull 2” superior to the EAM
Eval criteria lateral skull cranium without rotation or tilt, sella turcica in profile, superimposed orbital roofs, greater wings of sphenoid, EAM and TMJ
PA axial skull alternate name Caldwell
Caldwell for skull positioning MSP centered, pt forehead and nose touch bucky, OML perpendicular
CR entry for Caldwell skull 15 degrees caudad exiting the nasion
CR entry for Caldwell skull for frontal bone CR perpendicular
CR entry for Caldwell skull for superior orbital fissures CR 20-25 degrees caudad
CR entry for Caldwell skull for rotundrum foramina CR 25-30 degrees caudad
Eval for Caldwell skull symmetric petrous ridges, no tilt or rotation, petrous ridges lie in the lower 1/3 of the orbits (w/ angle), petrous ridges fill the orbits (no angle)
AP axial skull alternate name Towne
Towne skull positioning TOF at cranial vertex, OML perpendicular to IR or IOML perpendicular (changes tube angle)
CR entry Towne for skull CR enters 2 ½” above glabella, angle 30 degrees caudad when OML perp. Angle 37 degrees when IOML perp.
Eval criteria Towne for skull no rotation or tilt, symmetric petrous ridges, dorsum sellae and posterior clinoid process seen through foramen magnum.
What piece of anatomy is used to determine rotation on a Towne skull? foramen magnum
A Towne for skull is done to view: the occipital bone
The Caldwell for skull is done to view: the frontal bone
SMV for skull positioning vertex touches bucky, MSP perpendicular, IOML parallel to IR
SMV for skull CR entry perpendicular to IOML, midway between the mandibular angles ¾” anterior to the level of the EAM
Created by: annaluz87