principles orbits

Question 0

Image criteria Caldwell orbits

Answer 0

Superior orbital fissures should well be demonstrated and projected well above above petrous ridges

Superior and lateral orbits margins well visualized

Question 1

Caldwell- orbits

Answer 1

8x10 cw
Structures
- superior orbital fissure
- super and lateral orbital margins

Erect, seated or prone
Place patients forehead and nose on table
Align midsaggital plane perpendicular to plane of film in midline of table
Adjust head so oml perpendicular to plane film

Central ray
35 degree caudad to exit orbits

Question 2

Modified orbits waters- orbits

Answer 2

8x10 cw

Structures

• orbital floors
• superior and inferior orbital margins

Best for blowout fractures

Erect, seated, or prone
Align maidsagital plane perpendicular to midline ir
Chin and nose on table
Head so oml forms 55 degree angle with plane

Central ray
Perpendicular to exit acanthion

Suspend respiration

Question 3

Image criteria modified waters orbits

Answer 3

Orbital floors well demonstrated

Petrous ridges seen overlying maxillary sinuses just below infraorbital margins

Question 4

Rhese optic foramen

Answer 4

8x10 cw

Structures

• optic canal
• superior and lateral orbital margins

Right and left optic foramina taken for comparison

Erect, seated, prone

Align midsagital plane to midline
Chin and nose on table
Rotate head to side being examined and rest chin , cheek and nose aka three point landing
Center affected orbit to midline table
Adjust degree of flexion of head to place acanthionmeatal line of unaffected orbit perpendicular
Head so midsagital plane forms 53 degree angle to plane( head rotated 37 degree true pa)

Central ray
Perpendicular to film to exit center of orbit nearest to table

Suspend respiration

Question 5

Image criteria rhese

Answer 5

Optic foreman visualized in lower quadrant of orbit

Optic canal should be demonstrated to cross section

Superior and lateral orbital margins well visualized

If patient can’t be prone- patient supine with midsagital plane midline of table.rotate head so Midsaggital plane forms 53 degree angle. Adjust acanthionmeatal line of unaffected perpendicular to film . Cr is perpendicular center to orbits that is elevated. Same structures shown but magnified because more oid