Digital subtraction angiography

Digital subtraction angiography (DSA) is an angiography method using computer-assisted imaging. It is a new X-ray examination technique that has been applied to the clinic since the 1970s. It is done using computer programs for two imaging sessions. Before the contrast agent is injected, the first imaging is performed, and the computer converts the image into a digital signal and stores it. After the contrast agent is injected, it is imaged again and converted into a digital signal. Subtract the two numbers, cancel the same signal, and get an image of the blood vessel with only contrast agent. This kind of image is clearer and more intuitive than that used in conventional cerebral angiography, and some fine vascular structures can also be displayed. The fusion of angiographic images with CT and MR images can more accurately display the anatomical structure, and the fusion with PET images can also reflect the pathological characteristics of target organs and target lesions. Siemens' original Syngo Fusion image fusion technology can achieve a variety of images Fusion imaging brings more accurate imaging results.