DSA

Digital subtraction angiography

Digital Subtraction Angiography (DSA) is an advanced imaging technique used to visualize blood vessels by digitally removing (subtracting) the background structures from images. It involves capturing a “mask” image of the area of interest before injecting a contrast dye into the blood vessels. After the contrast is injected, a second image is taken. The two images are then digitally subtracted from each other, leaving a clear view of the blood vessels without the interference of bones or other tissues.

DSA is commonly used in diagnosing vascular conditions such as aneurysms, stenosis, or arteriovenous malformations, and it enhances the precision of interventional radiological procedures.