digital subtraction angiography
Also written as: DSA — Digital Subtraction Angiography
Gold standard invasive imaging technique that removes background structures to highlight contrast-filled blood vessels.
Full Definition
Digital subtraction angiography (DSA) is an invasive fluoroscopic technique that involves catheter-based injection of iodinated contrast material directly into blood vessels. The 'subtraction' process digitally removes background bone and soft tissue structures from the images, leaving only the contrast-enhanced vasculature visible with exceptional detail and temporal resolution. DSA provides the highest spatial and temporal resolution of all angiographic techniques and remains the gold standard for detecting subtle vascular pathology, planning interventions, and guiding endovascular procedures. Despite its invasive nature and associated risks, DSA is essential for complex vascular evaluations and therapeutic interventions.
Usage
Usage note: Often considered the reference standard against which other angiographic techniques are compared.
In Context
- "Digital subtraction angiography confirmed the presence of a small intracranial aneurysm." — Interventional radiology report
- "DSA was performed to evaluate the patency of the bypass graft." — Vascular surgery follow-up