What is digital subtraction angiography?

Digital Subtraction Angiography (DSA) is a photography technique, which removes the images of bones and soft tissues from the angiogram by computer, and only highlights the blood vessels in the angiogram.

Digital subtraction angiography (DSA) is a computer-aided angiography method, and it is a brand-new X-ray examination technique applied in clinic since 1970s. It is done by twice imaging with a computer program. Before the contrast agent is injected, the first imaging is performed, and the image is converted into a digital signal by the computer and stored. After injection of contrast agent, it is imaged again and converted into digital signal. Two times of digital subtraction, the same signal is eliminated, and a blood vessel image with only contrast agent is obtained. This kind of image is clearer and more intuitive than that displayed by conventional cerebral angiography, and it can also show some subtle vascular structures.

The fusion of angiographic images with CT and MR images can show the anatomical structure more accurately, and the fusion with PET images can also reflect the pathological characteristics of target organs and lesions. Syngo Fusion, the original image fusion technology of Siemens, can realize the fusion imaging of multiple images and bring more accurate imaging results.