MRI Brain and Orbits

MRI (magnetic resonance imaging) uses powerful magnets and radio waves to create detailed images of the brain, optic nerves, and eye sockets (orbits). It's essential for diagnosing many neuro-ophthalmic conditions.

Why It's Ordered

• Evaluate optic neuritis and look for MS
• Rule out tumors (pituitary, meningioma)
• Assess for stroke
• Evaluate unexplained vision loss
• Check for thyroid eye disease muscle changes
• Look for causes of cranial nerve palsies

What to Expect

Before the MRI

• Remove all metal (jewelry, watches, hearing aids)
• Tell staff about implants, pacemakers, or metal in body
• Change into hospital gown
• May need IV for contrast

During the MRI

• Lie still on table that slides into tube
• Loud clicking/banging sounds (ear protection provided)
• Can communicate with technologist
• Takes 30-60 minutes
• Must stay very still

After the MRI

• Can resume normal activities immediately
• Results interpreted by radiologist
• Doctor will discuss findings

Special Sequences

For Optic Nerve

• Fat-suppressed images highlight nerve
• Show inflammation and enhancement

For MS

• FLAIR sequences show white matter lesions
• Gadolinium shows active inflammation

MRA/MRV

• MR angiography—blood vessels
• MR venography—venous sinuses for clots

If You're Claustrophobic

• Open MRI available at some centers
• Sedation can be arranged
• Music or earplugs help
• Close your eyes
• Tell staff beforehand

For comprehensive information about preparing for your MRI, managing claustrophobia, and understanding your results, see our guide: Understanding Your MRI - A Patient's Complete Guide.