What is this test?
CT Angiography (CTA) of the brain is a specialized CT scan that uses intravenous contrast dye to produce highly detailed images of the cerebral blood vessels. This technique combines the speed of CT imaging with contrast-enhanced visualization to map arteries and veins in the brain, allowing precise assessment of vascular anatomy and blood flow. It is a non-invasive, rapid diagnostic tool crucial for detecting blood vessel abnormalities and guiding treatment decisions.
What is it used for?

• Detecting brain aneurysms — weakened vessel walls that can rupture
• Identifying vascular malformations, such as arteriovenous malformations (AVMs)
• Visualizing blood vessel blockages or narrowing (stenosis) that can lead to strokes or transient ischemic attacks
• Evaluating vasculitis or inflammation of cerebral vessels
• Planning interventions such as clot retrieval or surgical repair of aneurysms
• Monitoring known vascular diseases for progression or complications

Who should get this test?

• Patients presenting with symptoms of stroke, transient ischemic attacks (TIAs), or sudden neurological changes
• Individuals suspected of having brain aneurysms or vascular malformations
• Patients with a history of subarachnoid hemorrhage or unexplained headaches
• Those being evaluated for cerebral vascular disease or planning neurosurgical procedures
• Patients with risk factors for vascular disease requiring detailed vessel imaging

Preparation Required:

• Kidney function must be assessed with blood tests to ensure it is safe to use contrast dye
• Hydration before and after the procedure is often recommended to protect kidney function
• Inform your healthcare provider about any allergies, especially to iodine-based contrast agents
• Fasting is generally not required, but follow specific instructions if given

How is the procedure performed?
During the CTA brain scan, an iodine-based contrast dye is injected intravenously to highlight blood vessels. The scan itself takes approximately 10 to 15 minutes. The patient lies still on a CT table that moves through the scanner as multiple rapid X-ray images are captured. The contrast allows visualization of arteries and veins in exquisite detail, highlighting any abnormalities. Patients may feel a warm sensation during the contrast injection.
Risks & Safety:
The procedure involves exposure to ionizing radiation, which is carefully minimized but carries a small risk. Contrast dye may rarely cause allergic reactions ranging from mild itching to, very rarely, severe reactions. Patients with kidney impairment are at higher risk for contrast-induced complications, which is why kidney function testing is essential before the scan.
Results:
A radiologist reviews the high-resolution images to detect aneurysms, stenosis, blockages, or vascular malformations. The detailed report guides neurologists, neurosurgeons, or interventional radiologists in diagnosis and treatment planning. Results are often available quickly in urgent cases.
Short Statement:
A detailed CT Angiography scan that maps the brain’s blood vessels using contrast — essential for identifying aneurysms, blockages, and vascular abnormalities swiftly and accurately.
Call to Action:
Worried about your brain’s blood flow or at risk for stroke? Schedule a Brain CTA to get advanced vascular imaging and make informed health decisions with confidence.