Final answer:
Digital Subtraction Angiography (DSA) is a fluoroscopic technique used to visualize blood vessels by digitally subtracting pre-contrast and post-contrast x-ray images.
Step-by-step explanation:
Digital Subtraction Angiography (DSA) is a fluoroscopic technique used to visualize blood vessels. It involves the injection of a contrast agent into the bloodstream, followed by the capture of x-ray images. By digitally subtracting a pre-contrast image from a post-contrast image, DSA can create clear images of blood vessels and detect abnormalities such as blockages or aneurysms.