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ORBIT Imaging anatomy
Imaging Recommendations
Radiography
Ultrasound
• First line modality for intraocular lesions
• Noninvasive, readily availa...
MR
• Optimal soft tissue contrast for globe, optic nerve, orbital
structures, and intracranial findings.
• Stronger gradie...
Radiography
WATERS PROJECTION
CM- canthomeatal line; CR- central ray.
(a, frontal sinus; b, medial orbital wall;
c, innomi...
CALDWELL PROJECTION
a, frontal sinus;
b, innominate line;
c, inferior orbital rim;
d, posterior orbital floor;
e, superior...
LATERAL PROJECTION
a, orbital roof;
b, frontal sinus;
c, ethmoid sinus;
d, anterior clinoid process;
e, sella turcica; f, ...
BASAL PROJECTION (SUBMENTO-VERTEX)
a, zygomatic arch;
b, orbit;
c, lateral orbital wall;
d, posterior wall of maxillary si...
OPTIC FORAMEN (RHESE POSITION)
a, right optic canal;
b, optic strut;
c, superior orbital fissure;
d, ethmoid sinus;
e, pla...
Sonography of eye
B-scan probe orientations
1. Axial scan is obtained by placing the probe face directly over
the center of the cornea.
The ...
B-scan probe orientations
2. Longitudinal B-scan require the probe to be placed on the
conjunctiva overlying the sclera an...
Imaging protocols
CT
• Axial + coronal planes; thin-sections (~ 2 mm),Multislice acquisition
• Soft tissue algorithm
• Con...
Bones of the Orbit
Bones of the Orbit
AXIAL BONE CT
CORONAL BONE CT
MR
• Axial: Above orbital roof to orbital floor
• Coronal: Back of pons through globe
• Thin-section (3-4 mm); small FOV (...
CORONAL T1 MR
OBLIQUE SAGITTAL T1 MR
Optic nerve-sheath complex
CORONAL &AXIAL STIR MR
GLOBE
THANK YOU
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
Orbit imaging anatomy
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Orbit imaging anatomy

  1. 1. ORBIT Imaging anatomy
  2. 2. Imaging Recommendations Radiography Ultrasound • First line modality for intraocular lesions • Noninvasive, readily available CT & MR are complementary techniques; both are indicated for evaluation of complex lesions CT • Excellent evaluation of orbit aided by natural contrast. between fat, bone, air & soft tissues. • Easily detects calcifications.
  3. 3. MR • Optimal soft tissue contrast for globe, optic nerve, orbital structures, and intracranial findings. • Stronger gradients, faster sequences, surface coils, routine use of fat suppression ± gadolinium improve image quality
  4. 4. Radiography WATERS PROJECTION CM- canthomeatal line; CR- central ray. (a, frontal sinus; b, medial orbital wall; c, innominate line; d, inferior orbital rim; e, orbital floor; f, maxillary antrum; g, superior orbital fissure; h, zygomatic-frontal suture; i, zygomatic arch)
  5. 5. CALDWELL PROJECTION a, frontal sinus; b, innominate line; c, inferior orbital rim; d, posterior orbital floor; e, superior orbital fissure; f, greater wing of sphenoid; g, ethmoid sinus; h, medial orbital wall; i, petrous ridge; j, zygomatic-frontal suture
  6. 6. LATERAL PROJECTION a, orbital roof; b, frontal sinus; c, ethmoid sinus; d, anterior clinoid process; e, sella turcica; f, planum sphenoidale
  7. 7. BASAL PROJECTION (SUBMENTO-VERTEX) a, zygomatic arch; b, orbit; c, lateral orbital wall; d, posterior wall of maxillary sinus; e, pterygoid plate; f, sphenoid sinus
  8. 8. OPTIC FORAMEN (RHESE POSITION) a, right optic canal; b, optic strut; c, superior orbital fissure; d, ethmoid sinus; e, planum sphenoidale; f, greater wing of sphenoid
  9. 9. Sonography of eye
  10. 10. B-scan probe orientations 1. Axial scan is obtained by placing the probe face directly over the center of the cornea. The resulting B-scan image includes the lens and is bisected by the optic nerve.
  11. 11. B-scan probe orientations 2. Longitudinal B-scan require the probe to be placed on the conjunctiva overlying the sclera and directed through the vitreous bypassing the lens. It produce a cross-section of the eye along a specific clock hour, displaying the anterior portion of the eye at the top of the screen and the optic nerve at the bottom.
  12. 12. Imaging protocols CT • Axial + coronal planes; thin-sections (~ 2 mm),Multislice acquisition • Soft tissue algorithm • Contrast for masses or inflammatory disease • Noncontrast only when in conjunction with MR
  13. 13. Bones of the Orbit
  14. 14. Bones of the Orbit
  15. 15. AXIAL BONE CT
  16. 16. CORONAL BONE CT
  17. 17. MR • Axial: Above orbital roof to orbital floor • Coronal: Back of pons through globe • Thin-section (3-4 mm); small FOV (12-16 cm) • T1 pre-contrast (axial + coronal) • STIR or T2 FSE fat-saturation (axial + coronal) • T1C+ with fat-saturation (axial+coronal) • Sagittal oblique for optic nerves
  18. 18. CORONAL T1 MR
  19. 19. OBLIQUE SAGITTAL T1 MR
  20. 20. Optic nerve-sheath complex
  21. 21. CORONAL &AXIAL STIR MR
  22. 22. GLOBE
  23. 23. THANK YOU
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