Which artifact is commonly seen with metallic objects and multiple reverberations within a highly reflective object?

Which artifact is commonly seen with metallic objects and multiple reverberations within a highly reflective object?

• A. Refraction
• B. Comet tail artifact
• C. Ring-down
• D. Mirror image

Answer: (B)

Reverberation from a highly reflective object creates a comet tail artifact in ultrasound. When something dense and highly reflective, like a metallic foreign body, is present, sound waves bounce between the object and the transducer, producing multiple, closely spaced echoes that extend behind the object. This creates the bright line with a trailing series of echoes—the “comet tail” that visually resembles a comet’s tail. It’s a classic sign of a metallic/foreign body and helps identify its presence. This differs from the mirror-image effect, which duplicates anatomy across a strong reflector, and from refraction or ring-down artifacts, which have different origins and appearances (ring-down is often linked to gas bubbles, not metal).

Reverberation from a highly reflective object creates a comet tail artifact in ultrasound. When something dense and highly reflective, like a metallic foreign body, is present, sound waves bounce between the object and the transducer, producing multiple, closely spaced echoes that extend behind the object. This creates the bright line with a trailing series of echoes—the “comet tail” that visually resembles a comet’s tail. It’s a classic sign of a metallic/foreign body and helps identify its presence. This differs from the mirror-image effect, which duplicates anatomy across a strong reflector, and from refraction or ring-down artifacts, which have different origins and appearances (ring-down is often linked to gas bubbles, not metal).