Which artifact is the result of reverberation?

Which artifact is the result of reverberation?

• A. Comet tail
• B. Acoustic speckle
• C. Beamwidth
• D. Refraction

Answer: (A)

Reverberation artifacts occur when the ultrasound pulse keeps bouncing between two strong reflectors, creating multiple echoes along the same path. A classic manifestation of this phenomenon is the comet-tail artifact, which appears as a bright, narrow line that seems to extend from a highly reflective object and tapers like a tail. This happens because the echoes from successive reflections pile up closely together, producing that characteristic comet-like appearance along the beam. The other options don’t fit this mechanism: acoustic speckle is the grainy pattern caused by interference from many tiny scatterers within tissue; beamwidth is a property of the imaging beam’s angular spread and affects resolution, not an artifact from reverberation; refraction is the bending of the sound beam at interfaces, which changes the location of structures rather than creating a tail of echoes.

Reverberation artifacts occur when the ultrasound pulse keeps bouncing between two strong reflectors, creating multiple echoes along the same path. A classic manifestation of this phenomenon is the comet-tail artifact, which appears as a bright, narrow line that seems to extend from a highly reflective object and tapers like a tail. This happens because the echoes from successive reflections pile up closely together, producing that characteristic comet-like appearance along the beam.

The other options don’t fit this mechanism: acoustic speckle is the grainy pattern caused by interference from many tiny scatterers within tissue; beamwidth is a property of the imaging beam’s angular spread and affects resolution, not an artifact from reverberation; refraction is the bending of the sound beam at interfaces, which changes the location of structures rather than creating a tail of echoes.