Normal MRI of the orbits

Normal MRI of the orbits

Normal MRI of the orbits


Introduction

This anatomical module of e-Anatomy is dedicated to the anatomy of the normal orbit on MRI. The orbital cavity includes the eyeball, the extraocular muscles, the lacrimal apparatus and the optic nerve.
This anatomy module focuses in particular on normal anatomical findings of the eye, including the bony orbit, the bones of cranium, the extraocular muscles, the fasciae of orbit and eyeball, the eyelids, and the six cranial nerves that innervate motor, sensory, and autonomic structures in the eyes (optic nerve (CN II), oculomotor nerve (CN III), trochlear nerve (CN IV), trigeminal nerve (CN V), abducens nerve (CN VI), and facial nerve (CN VII)).

This ocular anatomy atlas has been designed to help radiologists, ophthalmologists and neurologic surgeons in their daily practice, especially for the magnetic resonance imaging of eye diseases like the diseases of the ophthalmic muscles (Thyroid-associated orbitopathy or Graves Disease), intra-conal lesions (vascular abnormalities, inflammation or optic neuroma), as well as extra-conal lesions (abscesses, cord tumors, and bone lesions).

 

Material and methods

This MR of the orbit was carried out on a healthy woman patient, using a Siemens 3T MRI. 
High-resolution MR images of the eye have been obtained in three anatomical planes (axial, sagittal and coronal planes) with the use of a dedicated coil. 

MRI sequences were chosen to optimize visualization of ocular anatomy

  • Coronal T2 TSE
  • Axial T2 TSE
  • Sagittal oblique T2 TSE
  • Coronal T1 TSE
  • Coronal T1 Dixon W - Gd
  • Axial T1 FS TSE - Gd

The anatomical structures were labeled by Antoine Micheau MD (Radiologist, Montpellier – France), using the Terminologia Anatomica 2.

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