Digital Subtraction Angiography (DSA) is a medical imaging technique used in interventional radiology for visualization of blood vessels. DSA uses X-rays and computer technology to produce clear images of blood vessels by removing radiopaque structures such as bone from the image. This procedure is often performed in a special room called a Cathlab (Catheterization Laboratory), which is equipped with sophisticated equipment to support catheterization procedures and other interventions.

• Diagnostic: to detect blood vessel abnormalities, such as blockages or aneurysms.
• Therapeutic: to treat abnormalities in blood vessels by inserting drugs, devices, or implants through a catheter.