An instrument or technique used to record and visualize blood vessels, typically producing images called angiograms.
Greek 'angeion' (blood vessel) + 'graphia' (writing/recording). Medical terminology developed in the mid-20th century as imaging technology advanced.
An angiograph basically writes a picture of your blood vessels—doctors inject dye and take images to see your circulatory system in action, and it's been revolutionizing how they detect blockages and problems!
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