digital subtraction angiography
Also written as: DSA — Digital Subtraction Angiography
Gold standard invasive imaging technique using contrast injection and digital image processing to visualize cerebral vasculature with high resolution.
Full Definition
Digital subtraction angiography (DSA) is an invasive imaging procedure that combines catheter-based contrast injection with advanced digital image processing to provide the highest resolution images of cerebral blood vessels. The technique subtracts pre-contrast images from contrast-enhanced images, eliminating bone and soft tissue to display only vascular structures. DSA remains the gold standard for evaluating complex vascular pathology, planning endovascular procedures, and providing therapeutic intervention. While CT and MR angiography are often sufficient for screening, DSA is essential for definitive diagnosis and treatment of aneurysms, arteriovenous malformations, and stenotic disease.
Usage
Usage note: Emphasize invasive nature and associated risks when discussing with patients or in clinical documentation.
In Context
- "DSA confirmed the presence of a complex anterior communicating artery aneurysm with a daughter sac." — Pre-procedural planning report
- "Digital subtraction angiography demonstrated successful coil embolization with complete aneurysm occlusion." — Post-intervention assessment