During a DSA run-off, what does the computer do to enhance arterial visualization?

During a DSA run-off, what does the computer do to enhance arterial visualization?

• A. Subtract bone landmarks and some motion
• B. Add bone landmarks to outline tissues
• C. Colorize only veins
• D. Create a 3D model from CT

Answer: (A)

In a DSA run-off, arterial visualization is sharpened by subtracting nonvascular structures from the images. The system uses a pre-contrast reference (a mask) and subtracts it from subsequent frames after contrast is injected, so bones and surrounding tissues disappear and the contrast-filled arteries stand out. Motion compensation is often applied as part of this subtraction to reduce misregistration from patient movement or cardiac motion, further clarifying the arterial tree. This method directly enhances arteries; it’s not about adding bone landmarks, coloring veins, or creating a CT-derived 3D model, which are different techniques or goals.

In a DSA run-off, arterial visualization is sharpened by subtracting nonvascular structures from the images. The system uses a pre-contrast reference (a mask) and subtracts it from subsequent frames after contrast is injected, so bones and surrounding tissues disappear and the contrast-filled arteries stand out. Motion compensation is often applied as part of this subtraction to reduce misregistration from patient movement or cardiac motion, further clarifying the arterial tree. This method directly enhances arteries; it’s not about adding bone landmarks, coloring veins, or creating a CT-derived 3D model, which are different techniques or goals.