Dsa is also called vascular subtraction computed imaging. It is the injection of contrast agent through the femoral artery cannula, scanning the cerebral blood vessels through ct, so as to analyze the cerebral vascular malformation and cerebral vascular tumor in detail. Subtraction means that tissues other than blood vessels are imaged on the ct and removed by computer. This technique is expensive, a surgical diagnostic treatment that requires hospitalization and costs 5,000.
CT is a digital image produced using x-ray computed tomography, and CTA, which is CT for angiography, is also known as enhanced Ct. Certain substances are injected into blood vessels using certain substances to better visualize the shape of the vessels, especially the state of blood flow.
--I am neither a master nor a professional, I am just a salesman who is learning about medical devices.