Digital subtraction angiography (DSA) is a fluoroscopy technique used in interventional radiology to clearly visualize blood vessels in a bony or dense soft tissue environment. Images are produced using contrast medium by subtracting a "pre-contrast image" or mask from subsequent images, once the contrast medium has been introduced into a ...

2025年1月21日 · Digital subtraction angiography (DSA) is a fluoroscopic technique used extensively in interventional radiology for visualization of blood vessels. Radiopaque structures such as bones are digitally eliminated ("subtracted") from the image, thus allowing for an accurate depiction of the blood vessels.

Digital Subtraction Angiography (DSA) Provides an image of the blood vessels in the brain to detect a problem with blood flow. The procedure involves inserting a catheter (a small, thin tube) into an artery in the leg and passing it up to the blood vessels in the brain.

The Digital Subtraction Angiography (DSA) technique can be applied to a fluoroscopy series (XA) to allow you to visualize blood vessels better. The pre-contrast image (so-called mask) is subtracted from the subsequent images in which the arteries/veins are filled with the contrast media and, thus, the bony or dense soft-tissue areas are removed ...

2023年9月1日 · The main research contents include: enhancing, segmenting, and reconstructing DSA images of the cardiovascular system, and performing vascular information fusion on multiple image frames in DSA dynamic images to improve the clarity and accuracy of DSA images.

1985年6月1日 · DSA EQUIPMENT AND TECHNOLOGY As stated before, the equipment used in digital subtraction angiography is a combination of x-ray equipment and high-speed image-processing equipment. The x-ray equipment at the University of Arizona consists of a state-of-theart x-ray generator and a large-field image intensifier coupled to a. television camera.

In DSA, the lowest tube voltage (i.e., 70 kV) is used to achieve the greatest image contrast between vessels or lesions opacified with contrast media and background and, thus, a longer pulse width (or a higher tube current–exposure time product [mAs]) is needed to preserve the signal–noise ratio.

数字减影血管造影(digital subtraction angiography， DsA)是影像增强技术、电视技术和计算机技术相结合的产 物，它是将造影前、后获得的数字图像进行数字减影，在减影 图像中消除骨骼和软组织结构，使低浓度的造影剂所充盈的 血管在减影中显示出来，有较高的图像对比度。 1 DSA的基本原理 当单能窄束X射线通过图1所示的两均匀介质量，有 . J—Ioexp[一(~BdB+ T T)] (1a) . 或 lnI=lnlo一( dB+ TdT) (1b) 式中／2n、／2r分别为骨和软组织的线性吸收系数，de、dr分别 为 …

2019年9月14日 · DSA, along with intra-procedural fluoroscopic guidance, is the imaging modality that allows these catheter-based interventional specialties to see, diagnose, and treat an ever-expanding number of vascular and nonvascular pathologies. To adequately intervene, however, a solid foundation in DSA “basics” is of paramount importance.

2024年12月30日 · Digital subtraction angiography (DSA) is a medical imaging technique used to visualize the blood vessels and their blood flow. It is a non-invasive and painless procedure that provides detailed images of the vascular system, allowing doctors to diagnose and treat various medical conditions.