Digital Subtraction Angiography (DSA) Scan

What is digital subtraction angiography (DSA)?

Digital subtraction angiography (DSA) is a diagnostic procedure to view the inner surface of blood vessels (also known as lumen). It can be used to view arteries, veins and heart chambers.

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DSA is a fluoroscopic technique (a technique that captures continuous images) that uses complex, computerised X-ray machines. A special contrast medium or 'dye' is injected into your blood to make the blood vessels easier to see.

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Images are taken before and after the contrast dye is injected. To highlight the blood vessels, software is used to digitally 'subtract' the first image from the second.

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