Comet tail is a classic example of which mechanism?

Comet tail is a classic example of which mechanism?

• A. Reverberation
• B. Refraction
• C. Speckle
• D. Ring-down

Answer: (A)

In ultrasound imaging, the comet tail artifact is a classic example of reverberation. When a very reflective object sits along the beam, the sound wave bounces back and forth between the object and the transducer, producing multiple echoes that form a dense, tapering line behind the object. This series of back-and-forth reflections creates the bright, narrow tail you see. Refraction would cause bending or shifting of structures due to speed changes at interfaces, not a tail of echoes. Speckle is a random granular pattern from the coherent imaging process, not a structured tail behind a reflector. Ring-down arises from resonating gas bubbles and typically appears as a series of echoes with a different physical mechanism than reverberation.

In ultrasound imaging, the comet tail artifact is a classic example of reverberation. When a very reflective object sits along the beam, the sound wave bounces back and forth between the object and the transducer, producing multiple echoes that form a dense, tapering line behind the object. This series of back-and-forth reflections creates the bright, narrow tail you see.

Refraction would cause bending or shifting of structures due to speed changes at interfaces, not a tail of echoes. Speckle is a random granular pattern from the coherent imaging process, not a structured tail behind a reflector. Ring-down arises from resonating gas bubbles and typically appears as a series of echoes with a different physical mechanism than reverberation.