Transcript File

Orbits & Eyes
Modified Occipito- mental (baseline 550 to
film)
 Occipito –frontal with 250- 300 caudal
angulation of the beam
 Lateral
 For Localization of IOFB – Three Lateral
projections with the patient looking Up,
Straight, & Down.
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Orbits – PA 250 - 300
Orbits – modified OM
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Median plane
perpendicular to
bucky
Inter orbital line
parallel to bucky
Chin is adjusted to
bring the base line
(plane) at 550 to
bucky
Central ray
perpendicular and to
pass through a point
in midline at the level
of the inferior orbital
margins
Optic Foramina
Note : The optic canals open into the rear of the bony
orbits, that is the optic foramina. The canals
pass forwards and laterally at approximately 350
to the median sagittal plane and downwards at
approximately 350 to the odito-meatal plane, and
this is the path the central ray must take to
demonstrate the foramen.
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Both sides must be done foe comparison
Optic Foramen
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Position the head so that
The Nose, Zygoma and
Chin of the side being
examined is in contact with
the bucky
Orbit in center of the bucky
Median sagital plane 530 to
bucky
The Acanthiomeatal line
(plane) is perpendicular to
the bucky
Beam – perpendicular & to
pass through the orbit
Optic foramen – PA oblique
Head in PA position related to the bucky
 Position the head so that The Nose,
Cheek and Chin of the side being
examined is in contact with the bucky
 Orbit in center of the bucky
 Median sagital plane 550 to bucky
 The base line (plane) is at 550 to the bucky
 Beam – perpendicular & to pass through
the orbit

Optic foramen- Radiographic
appearance
Criteria
 Optic foramen
visible at the end
of the sphenoid
ridge in inferior
and lateral
quadrant of the
orbit.
Optic foramen