Which artifact appears as a bright, comet-tail like streak behind a strong reflector?

Which artifact appears as a bright, comet-tail like streak behind a strong reflector?

• A. Slice thickness
• B. Side lobes
• C. Reverberation
• D. Comet tail

Answer: (D)

The main idea is recognizing the comet-tail as a distinct type of reverberation artifact. When a very strong reflector is present, the ultrasound beam can bounce back and forth in a tight space, creating a dense series of echoes that collapse into a single bright, tapering streak that trails behind the reflector—like a comet. This trailing, bright pattern is the hallmark of the comet-tail artifact. Slice-thickness artifacts arise from partial volume effects in the imaging plane and blur edges, not from a trailing tail behind a strong reflector. Side lobes come from off-axis energy creating spurious echoes away from the true structure. Reverberation in general produces multiple parallel echoes, but the specific bright, comet-like tail behind a strong reflector is what identifies the comet-tail artifact.

The main idea is recognizing the comet-tail as a distinct type of reverberation artifact. When a very strong reflector is present, the ultrasound beam can bounce back and forth in a tight space, creating a dense series of echoes that collapse into a single bright, tapering streak that trails behind the reflector—like a comet. This trailing, bright pattern is the hallmark of the comet-tail artifact.

Slice-thickness artifacts arise from partial volume effects in the imaging plane and blur edges, not from a trailing tail behind a strong reflector. Side lobes come from off-axis energy creating spurious echoes away from the true structure. Reverberation in general produces multiple parallel echoes, but the specific bright, comet-like tail behind a strong reflector is what identifies the comet-tail artifact.