Digital subtraction angiography
An invasive imaging technique using contrast injection and digital image processing to create high-resolution vascular images by subtracting non-contrast from contrast images.
Full Definition
Digital subtraction angiography (DSA) represents the gold standard for vascular imaging, providing real-time, high-resolution visualization of blood vessels through selective contrast injection. The technique involves acquiring pre-contrast mask images, then subtracting these from contrast-enhanced images to eliminate background structures and highlight vascular anatomy. DSA offers superior spatial and temporal resolution compared to non-invasive modalities, enables precise stenosis quantification, and allows simultaneous therapeutic intervention, though it carries risks of contrast nephropathy, bleeding, and arterial injury.
Usage
Usage note: Abbreviate as DSA after first use. Always document contrast volume and access site complications.
In Context
- "Digital subtraction angiography confirmed 90% stenosis of the superficial femoral artery, prompting immediate balloon angioplasty." — Interventional procedure report
- "DSA remains the definitive diagnostic modality when non-invasive imaging provides conflicting or inconclusive results." — Clinical guidelines