Catheter is passed through the lumen of blood vessels and contrast material is injected in the cerebral arteries
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During cardiac catheterization, a long thin tube called a catheter is inserted in an artery or vein in your groin, neck or arm and threaded through your blood vessels to your heart.
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The wire is removed, and contrast medium is injected through the catheter. Both the arteries and the structures they supply with blood can then be visualized. A technique called digital subtraction angiography (DSA) is particularly useful in diagnosing arterial occlusion (blockage).........................
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