Spatial compounding imaging primarily reduces which ultrasound artifact?

Spatial compounding imaging primarily reduces which ultrasound artifact?

• A. Grating lobes
• B. Mirror image
• C. Reverberation
• D. Acoustic speckle

Answer: (D)

Spatial compounding reduces speckle by using multiple viewing angles and averaging the resulting images. Speckle is the grainy pattern produced when scattered echoes from many tiny tissue structures interfere coherently. When you image from different angles, the speckle pattern changes because the interference varies with angle. Averaging these views diminishes the random speckle variations, yielding a smoother image with better apparent contrast and structure delineation. Other artifacts have different causes—grating lobes come from array design, mirror-image artifacts from strong interfaces causing ghost echoes, and reverberation from multiple reflections—so they aren’t targeted as directly by spatial compounding as speckle reduction is.

Spatial compounding reduces speckle by using multiple viewing angles and averaging the resulting images. Speckle is the grainy pattern produced when scattered echoes from many tiny tissue structures interfere coherently. When you image from different angles, the speckle pattern changes because the interference varies with angle. Averaging these views diminishes the random speckle variations, yielding a smoother image with better apparent contrast and structure delineation. Other artifacts have different causes—grating lobes come from array design, mirror-image artifacts from strong interfaces causing ghost echoes, and reverberation from multiple reflections—so they aren’t targeted as directly by spatial compounding as speckle reduction is.