Orbits Positioning

Question 1

Whats another name for the optic foramen view orbits?

Answer 1

Rhese Method

Question 2

Whats another name for the rhese method?

Answer 2

Optic foramen view

Question 3

What are the structures seen for the optic foramen (rhese method) orbits?

Answer 3

• 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

Question 4

Where is the CR for an optic foramen (rhese method) orbits?

Answer 4

• Enters 1” superior and posterior to the TEA (top of ear attachment)
• Exits mid orbit on side closest to IR

Question 5

How is the patient positioned for an optic foramen (rhese method) orbits?

Answer 5

• The patient is prone
• Chin, cheek, and nose resting against the table (3 point landing)

Question 6

What is a 3 point landing?

Answer 6

Where the chin, cheek, and nose are pressed against a surface

Question 7

What is it called when the chin, cheek, and nose are pressed against a surface?

Answer 7

3 point landing

Question 8

Where is the AML for an optic foramen (rhese method) orbits?

Answer 8

Perpendicular to IR

Question 9

Where is the MSP for an optic foramen (rhese method) orbits?

Answer 9

• 37 degrees from vertical
• 53 degrees from horizontal

Question 10

What are the structures seen for a lateral orbit view (most affected side only)?

Answer 10

• 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

Question 11

Where is the CR for a lateral orbit view (most affected side only)?

Answer 11

Perpendicular to IR centered to outer canthus of eye

Question 12

How is the patient positioned for a lateral orbit view (most affected side only)?

Answer 12

• Patient in RAO or LAO
• Adjust head to true lateral
• Instruct patient to look straight ahead

Question 13

Where is the MSP for a lateral orbit view (most affected side only)?

Answer 13

Parallel to plane of IR

Question 14

Where is the IP line for a lateral orbit view (most affected side only)?

Answer 14

perpendicular to the plane of IR

Question 15

Where is the IOML for a lateral orbit view (most affected side only)?

Answer 15

Perpendicular to the edge of IR

Question 16

Whats another name for the parietoacanthial orbits view?

Answer 16

Modified waters method

Question 17

What another name for the modified waters method orbits view?

Answer 17

parietoacanthial view

Question 18

What are the structures seen for a parietoacanthial (modified waters) orbit view?

Answer 18

• Petrous pyramids lying low below the orbital shadows
• Symmetrical visualization of orbits
• Demonstrates localization of foreign body

Question 19

Where is the CR for a parietoacanthial (modified waters) orbit view?

Answer 19

Perpendicular to mid-IR exiting the orbits

Question 20

Where is the OML for a parietoacanthial (modified waters) orbit view?

Answer 20

50 degrees with IR

Question 21

Where is the MSP for a parietoacanthial (modified waters) orbit view?

Answer 21

Perpendicular to IR

Question 22

How is the patient positioned for a parietoacanthial (modified waters) orbit view?

Answer 22

• Patient in PA/prone position
• Head tilted back with chin resting on table/bucky
• Patients eyes are closed

Question 23

What structures are seen for a PA axial orbit view?

Answer 23

• Symmetrical superior orbital fissures demonstrated between the greater and lesser wings of the sphenoid bone
• Petrous pyramids below inferior margins of the orbits

Question 24

Where is the CR for a PA axial orbit view?

Answer 24

Exits through the center of the orbits

Question 25

Where is the MSP & OML for a PA axial orbit view?

Answer 25

Perpendicular to IR

Question 26

How is the patient positioned for a PA axial orbit view?

Answer 26

- Patient is prone/upright - Patient rests forehead and nose on table/bucky - Patients eyes are closed

Question 27

How much is the CR angled for a PA axial orbit view?

Answer 27

30 degrees caudal

Question 28

Whats the difference between a PA caldwell and a PA axial?

Answer 28

- PA caldwell uses a 15 degree caudal angle - PA axial used 30 degrees caudal angle

Question 29

What do you do to the kVp for a PA Caldwell orbit view?

Answer 29

Increase kVP by 5 to compensate for large CR angle

Question 30

What breathing technique do you use for a PA Caldwell orbit view?

Answer 30

Suspended respiration

Question 31

What SID is used for a PA Caldwell orbit view?

Answer 31

40" bucky

Question 32

What IR is used for a PA Caldwell orbit view?

Answer 32

10x12 portrait

Question 33

What SID is used for an optic foramen (rhese method) orbits?

Answer 33

40" bucky

Question 34

What IR is used for an optic foramen (rhese method) orbits?

Answer 34

10x12 transverse

Question 35

What breathing technique is used for an optic foramen (rhese method) orbits?

Answer 35

Suspended respiration

Question 36

What SID is used for a lateral orbit view (most affected side only)?

Answer 36

40" bucky

Question 37

What IR is used for a lateral orbit view (most affected side only)?

Answer 37

10x12 portrait

Question 38

What breathing technique is used for a lateral orbit view (most affected side only)?

Answer 38

Suspend respiration

Question 39

What SID is used for a parietoacanthial (modified waters) orbit view?

Answer 39

40" bucky

Question 40

What IR is used for a parietoacanthial (modified waters) orbit view?

Answer 40

10x12 portrait

Question 41

What breathing technique is used for a parietoacanthial (modified waters) orbit view?

Answer 41

Suspended respiration