CT BRAIN + VENOGRAM
Also Known As
Lab Test
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About The Test
When persistent headaches, blurred vision, or unexplained dizziness strike, the cause may lie in the veins that drain blood from your brain. CT BRAIN+VENOGRAM—also called CT Cerebral Venography—offers a painless, 15-minute scan that maps these veins in stunning detail. At Cadabams Diagnostics, we combine advanced 128-slice CT technology with compassionate care to give you answers fast.
What is CT Cerebral Venography?
CT Cerebral Venography is a specialized CT BRAIN+VENOGRAM study that uses iodine-based contrast dye and rapid X-ray imaging to create 3-D pictures of the brain’s venous system. Unlike standard head CT, it focuses on the dural venous sinuses and cortical veins, highlighting blockages, clots, or malformations that could trigger strokes or seizures.
When and Who Needs to Take a CT Cerebral Venography?
Common Indications
- Sudden, severe headache or thunderclap headache
- Blurred vision, double vision, or papilledema
- Suspected cerebral venous sinus thrombosis (CVST)
- Known clotting disorders (Factor V Leiden, antiphospholipid syndrome)
- Postpartum or post-operative neurological symptoms
- Evaluation before major sinus or brain surgery
List of Parameters
- Venous sinus patency (superior sagittal, transverse, sigmoid)
- Cortical vein caliber & filling defects
- Presence of collateral circulation
- Brain parenchyma for edema, hemorrhage, or infarct
- Skull bone integrity (to rule out fractures)
Why This Test
| Reason | Why It Matters |
|---|---|
| Rule out CVST | Prevents delayed diagnosis and stroke |
| Unexplained raised intracranial pressure | Identifies venous outflow obstruction |
| Post-traumatic headache | Detects occult dural tear or sinus injury |
| Monitor anticoagulation therapy | Confirms clot resolution |
When to Take Test
Benefits
Benefits of Taking the Test
- Fast: 5–10 minutes on the table, report within 60 minutes
- Non-invasive: No catheter insertion into the brain
- High accuracy: 95 % sensitivity for large-vessel CVST
- Same-day consultation with Cadabams Diagnostics neuroradiologist
- Digital access to images via secure patient portal
Illnesses Diagnosed with CT Brain + Venogram
- Cerebral venous sinus thrombosis (CVST)
- Idiopathic intracranial hypertension
- Dural arteriovenous fistula (dAVF)
- Venous sinus stenosis
- Skull-base tumors compressing venous sinuses
Preparing for test
Do’s
- Arrive 30 minutes early for registration
- Bring previous imaging CDs or reports
- Inform staff of pregnancy or contrast allergies
Don’ts
- Avoid caffeine 4 hours prior (reduces motion)
- No metal hairpins or earrings (cause artifacts)
- Fasting not required, but light meal preferred
Pre-requisites
- Kidney Function Test (serum creatinine or eGFR) within 4 weeks
- Consent form signed after allergy screening
- Diabetes medication review—metformin may need pause for 48 h post-contrast
Best Time to Take the CT Cerebral Venography
- Acute symptoms: same day or within 24 h
- Routine follow-up: 6–12 weeks after starting anticoagulation
- Pre-surgical planning: 1–2 days before the scheduled operation
Eligibility
| Eligible | Not Eligible |
|---|---|
| Adults & adolescents > 14 years | Pregnant women (unless urgent) |
| Stable vitals | Severe renal failure (eGFR < 30) |
| No iodine hypersensitivity | Uncooperative patients requiring sedation |
Procedure for Taking a CT Cerebral Venography
- Check-in: Verify ID, allergy history, and creatinine report.
- IV line insertion: 18–20 G cannula in the antecubital vein.
- Positioning: Lie supine, head in the CT head-holder.
- Contrast injection: 80–100 mL non-ionic iodine at 4 mL/s.
- Scanning: Table moves through the gantry in < 10 s.
- Recovery: 15-minute observation for delayed reactions.
- Report: Soft copy emailed; hard copy optional.
Caution Before Taking the Test
- Allergic to shellfish? Inform technician—cross-reactivity possible.
- Breastfeeding? Pump and discard milk for 24 h after contrast.
- Claustrophobic? Open-bore CT with music available.
Test Results
Results and Interpretations
| Finding / Observation | Description | General Interpretation / Significance |
|---|---|---|
| Patent sinuses | Normal study | Symptom review with physician |
| Filling defect | Possible clot | Anticoagulation or interventional consult |
| Mass effect | Tumor or abscess | MRI or neurosurgery referral |
| Bone fracture | Traumatic cause | Neurosurgery evaluation |
Risks & Limitations
- Contrast allergy (rare; pre-medication available)
- Radiation exposure: equal to ~4 months of natural background—lower than conventional angiography
- Kidney stress if eGFR < 30 mL/min; alternative MRI may be advised
- Limitation: Very small distal clots (< 1 mm) may be missed; clinical correlation is key
Types of CT Cerebral Venography
- Standard CT Brain + Venogram – single-session imaging of brain parenchyma and veins
- Low-Dose Protocol – 30 % less radiation for follow-up scans
- Dual-Energy CT Venography – enhanced clot-to-blood contrast for difficult cases
FAQs
Is CT BRAIN+VENOGRAM painful?
No. You may feel a warm flush for 30 seconds during contrast injection—that’s normal.
Can I drive home after the scan?
Yes, unless you received sedation (rare).
How much radiation is involved?
Roughly 2–3 mSv—similar to 6 months of natural background radiation.
How long does the procedure take and when will I get my results?
The entire appointment at Cadabams Diagnostics typically takes about 15-20 minutes, with the actual scan time being less than a minute. For non-urgent scans, your detailed report is sent to your referring doctor within 24 hours. For urgent cases, the results are communicated much faster.
What is the approximate cost of a CT brain venogram?
The ct brain venogram cost can vary based on your location, specific requirements, and insurance coverage. For precise pricing, insurance details, or to get a cost estimate, please contact our billing department or the front desk at your nearest Cadabams Diagnostics center.