Averages the data in pixels over successive frames.

Averages the data in pixels over successive frames.

• A. Frame averaging
• B. Persistence
• C. Read-zoom
• D. Spatial compounding

Answer: (A)

Temporal averaging reduces speckle by averaging pixel values across successive frames. By combining multiple frames, random speckle fluctuations tend to cancel out, revealing the underlying signal more clearly and increasing the signal-to-noise ratio. However, this temporal integration can blur moving structures, lowering temporal resolution. The other terms refer to different approaches: spatial compounding blends information from different angles, read-zoom is simply magnification, and persistence uses prior frames to stabilize the image but isn’t defined strictly by averaging across frames.

Temporal averaging reduces speckle by averaging pixel values across successive frames. By combining multiple frames, random speckle fluctuations tend to cancel out, revealing the underlying signal more clearly and increasing the signal-to-noise ratio. However, this temporal integration can blur moving structures, lowering temporal resolution. The other terms refer to different approaches: spatial compounding blends information from different angles, read-zoom is simply magnification, and persistence uses prior frames to stabilize the image but isn’t defined strictly by averaging across frames.