What does DSA mean in medicine?

Digital subtraction angiography (DSA) is a new X-ray imaging system, which is a combination of traditional angiography and computer image processing technology. The basic content of subtraction technology is to subtract two images of the same part of the human body, so as to get their difference; The image without contrast agent is called mask image or mask, and the image obtained after injection of contrast agent is called imaging or filling image. Broadly speaking, the mask image is an image to be subtracted, while the created image is a subtraction image, and the image obtained after subtraction is a subtraction image. In the subtraction image, background images such as bones and soft tissues are eliminated, leaving only blood vessel images containing contrast agents.

Extended data:

DSA is suitable for examining the great vessels of the heart. It clearly shows abnormal anatomical structure, aortic dissection, aortic aneurysm, coarctation and branch stenosis of aorta, and abnormal development of aorta. It is also the best display method of coronary artery. It can be used to diagnose carotid artery stenosis or occlusion, intracranial aneurysm, arterial occlusion and vascular dysplasia, and observe the blood supply arteries of intracranial tumors. DSA is also effective in examining abdominal aorta and its branches and great vessels of limbs. UNt Image Park-Sharing Radiological Medical Resources.

Baidu encyclopedia-digital subtraction angiography