Cerebral angiography is simply the imaging of the brain vessels. Since the brain is surrounded by skull bones, quality imaging is required to reveal all vascular pathologies, not just imaging. Normal heart angio devices are insufficient regarding this. Therefore, DSA, which is the abbreviation of Digital Subtraction Angiography words, should be done. Digital subtraction angiography removes bones and all other tissues, allows only vein imaging and reveals all vessels, provides excellent imaging. Subtraction in the term means subtraction. It refers to removing extravascular tissues.