Orbits Positioning Flashcards
Whats another name for the optic foramen view orbits?
Rhese Method
Whats another name for the rhese method?
Optic foramen view
What are the structures seen for the optic foramen (rhese method) orbits?
- Optic canal and optic foramen visible at end of sphenoid ridge in inferior and lateral quadrant of orbit
- Entire orbital rim
- Supraorbital margins on same line
Where is the CR for an optic foramen (rhese method) orbits?
- Enters 1” superior and posterior to the TEA (top of ear attachment)
- Exits mid orbit on side closest to IR
How is the patient positioned for an optic foramen (rhese method) orbits?
- The patient is prone
- Chin, cheek, and nose resting against the table (3 point landing)
What is a 3 point landing?
Where the chin, cheek, and nose are pressed against a surface
What is it called when the chin, cheek, and nose are pressed against a surface?
3 point landing
Where is the AML for an optic foramen (rhese method) orbits?
Perpendicular to IR
Where is the MSP for an optic foramen (rhese method) orbits?
- 37 degrees from vertical
- 53 degrees from horizontal
What are the structures seen for a lateral orbit view (most affected side only)?
- Superimposed orbital roofs
- Demonstrates foreign body
- Perform upright if suspected blow out fracture or another fracture is noted to rule out blood in the sinus cavity
Where is the CR for a lateral orbit view (most affected side only)?
Perpendicular to IR centered to outer canthus of eye
How is the patient positioned for a lateral orbit view (most affected side only)?
- Patient in RAO or LAO
- Adjust head to true lateral
- Instruct patient to look straight ahead
Where is the MSP for a lateral orbit view (most affected side only)?
Parallel to plane of IR
Where is the IP line for a lateral orbit view (most affected side only)?
perpendicular to the plane of IR
Where is the IOML for a lateral orbit view (most affected side only)?
Perpendicular to the edge of IR
Whats another name for the parietoacanthial orbits view?
Modified waters method
What another name for the modified waters method orbits view?
parietoacanthial view
What are the structures seen for a parietoacanthial (modified waters) orbit view?
- Petrous pyramids lying low below the orbital shadows
- Symmetrical visualization of orbits
- Demonstrates localization of foreign body
Where is the CR for a parietoacanthial (modified waters) orbit view?
Perpendicular to mid-IR exiting the orbits
Where is the OML for a parietoacanthial (modified waters) orbit view?
50 degrees with IR
Where is the MSP for a parietoacanthial (modified waters) orbit view?
Perpendicular to IR
How is the patient positioned for a parietoacanthial (modified waters) orbit view?
- Patient in PA/prone position
- Head tilted back with chin resting on table/bucky
- Patients eyes are closed
What structures are seen for a PA axial orbit view?
- Symmetrical superior orbital fissures demonstrated between the greater and lesser wings of the sphenoid bone
- Petrous pyramids below inferior margins of the orbits
Where is the CR for a PA axial orbit view?
Exits through the center of the orbits
Where is the MSP & OML for a PA axial orbit view?
Perpendicular to IR
How is the patient positioned for a PA axial orbit view?
- Patient is prone/upright
- Patient rests forehead and nose on table/bucky
- Patients eyes are closed
How much is the CR angled for a PA axial orbit view?
30 degrees caudal
Whats the difference between a PA caldwell and a PA axial?
- PA caldwell uses a 15 degree caudal angle
- PA axial used 30 degrees caudal angle
What do you do to the kVp for a PA Caldwell orbit view?
Increase kVP by 5 to compensate for large CR angle
What breathing technique do you use for a PA Caldwell orbit view?
Suspended respiration
What SID is used for a PA Caldwell orbit view?
40” bucky
What IR is used for a PA Caldwell orbit view?
10x12 portrait
What SID is used for an optic foramen (rhese method) orbits?
40” bucky
What IR is used for an optic foramen (rhese method) orbits?
10x12 transverse
What breathing technique is used for an optic foramen (rhese method) orbits?
Suspended respiration
What SID is used for a lateral orbit view (most affected side only)?
40” bucky
What IR is used for a lateral orbit view (most affected side only)?
10x12 portrait
What breathing technique is used for a lateral orbit view (most affected side only)?
Suspend respiration
What SID is used for a parietoacanthial (modified waters) orbit view?
40” bucky
What IR is used for a parietoacanthial (modified waters) orbit view?
10x12 portrait
What breathing technique is used for a parietoacanthial (modified waters) orbit view?
Suspended respiration
