Which technique averages frames from different angles to improve visualization and reduce speckle/noise?

Which technique averages frames from different angles to improve visualization and reduce speckle/noise?

• A. Spatial Compounding
• B. Reverberation
• C. Reflections
• D. Shadowing

Answer: (A)

Spatial compounding works by acquiring ultrasound data from multiple insonation angles and then averaging those images to form a single composite view. Because speckle in ultrasound is highly angle-dependent, combining frames from different directions smooths out the grainy texture and enhances true tissue interfaces, making borders crisper and subtle lesions easier to see. This approach improves overall visualization and contrast resolution, especially in areas with poor single-angle detail. The trade-off is typically a slower frame rate since more views must be captured and processed. The other terms describe artifacts or features not produced by averaging across angles—reverberation involves repeated echoes from interfaces, reflections are echoes from tissue boundaries, and shadowing is signal loss behind a dense object.

Spatial compounding works by acquiring ultrasound data from multiple insonation angles and then averaging those images to form a single composite view. Because speckle in ultrasound is highly angle-dependent, combining frames from different directions smooths out the grainy texture and enhances true tissue interfaces, making borders crisper and subtle lesions easier to see. This approach improves overall visualization and contrast resolution, especially in areas with poor single-angle detail. The trade-off is typically a slower frame rate since more views must be captured and processed. The other terms describe artifacts or features not produced by averaging across angles—reverberation involves repeated echoes from interfaces, reflections are echoes from tissue boundaries, and shadowing is signal loss behind a dense object.