Which technique reduces speckle by combining information from different angles?

Which technique reduces speckle by combining information from different angles?

• A. Frame averaging
• B. Increased gain
• C. Noise filter
• D. Compound imaging

Answer: (D)

Speckle is a random interference pattern created by echoes from many tiny tissue structures. When you image from a single angle, you lock in that specific speckle pattern, which can obscure edges and slow down contrast. Compound imaging reduces speckle by collecting data from several different viewing angles and then combining those views into one image. Since the speckle pattern changes with angle, averaging or merging the angles smooths out the random speckle fluctuations while keeping real tissue boundaries visible. The result is a clearer image with better edge definition and contrast. Framing through time would lessen temporal noise but not rely on angle, increasing gain boosts all signals including noise, and a noise filter reduces noise in a single image rather than leveraging information from multiple angles, so they don’t achieve the same speckle reduction that angular compounding provides.

Speckle is a random interference pattern created by echoes from many tiny tissue structures. When you image from a single angle, you lock in that specific speckle pattern, which can obscure edges and slow down contrast. Compound imaging reduces speckle by collecting data from several different viewing angles and then combining those views into one image. Since the speckle pattern changes with angle, averaging or merging the angles smooths out the random speckle fluctuations while keeping real tissue boundaries visible. The result is a clearer image with better edge definition and contrast.

Framing through time would lessen temporal noise but not rely on angle, increasing gain boosts all signals including noise, and a noise filter reduces noise in a single image rather than leveraging information from multiple angles, so they don’t achieve the same speckle reduction that angular compounding provides.