CT Orbit Scan for Eye Injury and Infection

A CT orbit scan uses thin slices to show the bones around the eye, the eye muscles, the optic nerve and the soft tissue of the eye socket. It is used after eye injuries, for suspected infection (orbital cellulitis), a foreign body, a bulging eye, double vision and tumours. MRI is used for the optic nerve and brain.

What Does CT Show Around the Eye?

CT is excellent for bone, so it shows fractures of the thin orbit walls, trapped muscles and air in the eye socket. It also shows infection spreading from the sinuses and enlarged eye muscles in thyroid eye disease. See CT scan for children if the patient is a child.

ProblemWhat CT may showBlow to the eyeFracture of the orbit floor or wall, bleedingSwollen, red eyelids with feverOrbital cellulitis or abscessMetal or glass in the eyeForeign body locationBulging eyeThyroid eye disease, tumour, vessel problemSinus infection spreading to the eyeSinus disease with orbital extension

When Is It Urgent?

• Sudden vision loss or double vision after injury
• Swollen, red, painful eyelids with fever, especially in children
• Pain with eye movement and a bulging eye
• Metal or glass injury

These need immediate eye and ENT care. Orbital cellulitis can threaten vision and spread to the brain.

CT vs MRI of the Orbit

CT is fast and best for bone injury, foreign bodies (except magnetic metal for MRI) and sinus disease. MRI is better for optic nerve, soft tissue tumours and brain involvement. Metal foreign bodies must be ruled out with CT or X-ray before MRI. See MRI orbit scan and MRI safety.

Preparation and Procedure

No fasting for a plain scan. Remove spectacles, earrings and hairpins. Keep your eyes closed and still. The scan takes a few minutes. Contrast is used for infection and tumours, with kidney and allergy checks. See CT scan with contrast.

A Practical Example

Rohan, 8, has a swollen red eyelid, fever and pain on eye movement after a cold. A CT orbit with contrast shows infection around the eye with a small abscess. He is admitted for IV antibiotics and the abscess is drained. Fast imaging protected his vision.

Care Tips and Key Facts

• Do not rub or press an injured eye
• Cover with a shield, not a pad, and go to an eye hospital
• Do not blow your nose hard after an orbital fracture
• Seek care early for eye swelling with fever

After the Scan and Next Steps

Take the report to an ophthalmologist or ENT specialist. Fractures with trapped muscles or double vision may need surgery, while infection needs antibiotics and sometimes drainage. Thyroid eye disease needs endocrine and eye care. Protect your eyes with safety glasses during work, sport and DIY tasks.

Questions to Ask Your Doctor

• Is there a fracture, infection or foreign body?
• Do I need surgery or only medicines?
• Should I also have an MRI?
• When can I return to work and sport?

Common Mistakes to Avoid

• Delaying care for swollen eyelids with fever.
• Having MRI before ruling out metal in the eye.
• Blowing the nose hard after a facial injury.

Booking, Timing and Report

Most CT scans can be booked on the same day, and the visit takes 20 to 40 minutes. Carry your prescription, old scans and a recent creatinine report if contrast is planned. Reports are usually ready within 24 hours, and images can be provided on a CD or digital link for your doctor.

Questions About Radiation and Children

The eye lens is sensitive to radiation, so low-dose protocols and shielding where suitable are used, particularly in children. A single orbital CT for injury or infection is justified when it guides treatment. If you have had repeated scans, tell your doctor and carry your records so unnecessary repeats are avoided.

Frequently Asked Questions

When is CT orbit needed?

After eye injury, for suspected infection, foreign body or bulging eye.

Is contrast needed?

For infection and tumours.

Is CT or MRI better?

CT for bone and injuries; MRI for nerve and tumours.

Is the scan safe for children?

Yes, with a low-dose protocol when needed.

Do I need fasting?

Only if contrast is planned.

How long does it take?

A few minutes.

Can it detect a foreign body?

Yes, metal and glass.

Is orbital cellulitis serious?

Yes, it needs urgent treatment.

When is the report ready?

Usually within 24 hours, faster in emergencies.

Book Your Test at Ganesh Diagnostic

Ganesh Diagnostic & Imaging Centre in Rohini, Delhi offers this test with trained radiology staff and clear reports. You can book an appointment online, check our branches across Delhi NCR, contact us for current rates, or explore all our services. Reports can be downloaded online through our patient portal, so you do not need to make a second trip just to collect them.

This article is for general information only. It does not replace advice from your doctor. Always follow your doctor's instructions for your test.

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• CT Scan: What It Is, Uses & How It Works
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