CT Venogram

A CT Venogram (also called CT Cerebral Venography) is a fast, non-invasive scan that maps the veins inside your brain and skull. At Cadabams Diagnostics, advanced 128-slice CT technology captures high-resolution images in minutes, helping doctors spot clots, blockages or malformations early—so treatment can start sooner.

CT Cerebral Venography is a specialised CT scan that uses intravenous contrast dye and X-ray imaging to visualise the venous sinuses and cerebral veins. The contrast highlights blood flow, revealing narrow, blocked or abnormally formed vessels that routine CT may miss.

Key features

• Takes under 10 minutes
• 3-D reconstruction for precise viewing
• Minimal radiation exposure with dose-reduction software

• Standard CT Venogram: Single-phase contrast injection
• Dual-Energy CT Venography: Enhances vessel clarity, reduces artefacts
• Dynamic CT Venography: Shows real-time blood flow in patients with shunts or fistulas Our radiologists pick the technique that best fits your symptoms.

We monitor:

• Venous sinus patency
• Presence of thrombus (density, size, location)
• Collateral drainage pathways
• Skull-base bone anomalies compressing veins
• Intracranial pressure signs

We monitor:

• Venous sinus patency
• Presence of thrombus (density, size, location)
• Collateral drainage pathways
• Skull-base bone anomalies compressing veins
• Intracranial pressure signs

• Rule out CVST before starting anticoagulation
• Investigate unexplained papilloedema
• Evaluate congenital venous malformations
• Monitor known thrombosis during treatment
• Pre-surgical planning for brain-tumour resection

Doctors usually order a CT Venogram if you have:

• Severe, unusual headaches
• Sudden vision changes
• History of blood-clotting disorders
• Symptoms of intracranial hypertension
• Suspected cerebral venous sinus thrombosis (CVST) If you are pregnant, have kidney disease or are allergic to iodine, let our team know—we’ll guide you on the next steps.

• Quick: Scan + report in <2 hours at Cadabams Diagnostics
• Accurate: 95 % sensitivity for detecting clots
• Comfortable: No long confinement like MRI
• Cost-effective: Lower price than invasive venography

• Cerebral venous sinus thrombosis
• Idiopathic intracranial hypertension
• Arteriovenous fistula
• Venous sinus stenosis
• Tumour invasion into venous sinuses nal veins)

1. Fast 2–4 hours before the scan (clear fluids allowed).
2. Remove jewellery and hairpins around the head.
3. Bring previous imaging (CT/MRI) for comparison.
4. Wear loose, metal-free clothing or change into our gown.

• Recent serum creatinine (<30 days) for kidney function
• Written consent after allergy screening
• Pregnancy test for women of child-bearing age (if applicable)

Schedule the scan as soon as acute symptoms appear—early morning slots are ideal to avoid long fasting and receive same-day results.

• Adults and children >5 years (weight ≥20 kg)
• Patients with stable renal function
• Those able to lie still for 5–10 minutes

1. Check-in: Verify ID and consent.
2. IV line: Contrast dye injected in the arm.
3. Positioning: Lie on the CT table, head in the cradle.
4. Scanning: Table moves slowly; you’ll hear gentle whirring.
5. Observation: 15-minute post-scan monitoring for reactions.
6. Report: Digital report and images sent to your doctor within 2 hours.

• Inform us about shellfish/iodine allergy or asthma
• Share any metformin or anticoagulant use
• Bring a companion if you feel anxious

Common, mild reactions

• Metallic taste from contrast
• Warm flush lasting 30 seconds Rare risks
• Allergic reaction to dye (1 in 1,000)
• Kidney stress in pre-existing disease
• Radiation exposure equivalent to ~4 months of natural background (still within safe limits) We screen every patient beforehand to keep risks minimal.