Digital Subtraction Angiography (DSA) is a photography technique that uses a computer to eliminate images of bone and soft tissue on angiograms and only highlight blood vessels on the images. DSA is an effective diagnostic method for cerebrovascular diseases. However, as it is a traumatic examination, it should not be the preferred or routine examination method for cerebrovascular diseases. It is necessary to master the indications and contraindications, and make relevant preparations
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