subtrakiangiografia

Subtraction angiography is a medical imaging technique used to visualize blood vessels, particularly those in the brain. It is a type of digital subtraction angiography (DSA) and is commonly employed in the diagnosis and treatment of cerebrovascular diseases. The procedure involves the injection of a contrast agent, typically iodine-based, into the bloodstream. The contrast agent is radiopaque, meaning it absorbs X-rays, allowing the blood vessels to be clearly visualized on the images.

The process begins with the acquisition of a baseline image of the area of interest, usually the brain. This is followed by the injection of the contrast agent. As the contrast agent flows through the blood vessels, a series of images are taken. These images are then digitally subtracted from the baseline image, resulting in a series of images that show only the blood vessels filled with the contrast agent. This subtraction technique enhances the visibility of the vessels, making it easier to identify any abnormalities such as aneurysms, stenoses, or occlusions.

Subtraction angiography is a valuable tool in the field of neuroradiology, providing detailed information about the structure and function of the cerebral vasculature. It is often used in conjunction with other imaging modalities, such as computed tomography (CT) and magnetic resonance imaging (MRI), to provide a comprehensive assessment of cerebrovascular health. The procedure is typically performed under local anesthesia and is considered safe with minimal risks, although there is a small risk of allergic reactions to the contrast agent.