Which term describes a shadow artifact related to curved boundaries on ultrasound?

Which term describes a shadow artifact related to curved boundaries on ultrasound?

• A. Edge shadow
• B. Acoustic enhancement
• C. Posterior shadowing
• D. Ring Tail

Answer: (A)

Edge shadow is the shadow artifact that arises at the edge of a curved boundary. When the boundary is rounded, the ultrasound beam is refracted at the edges and energy is directed away from the edge region, leaving a dark, wedge-shaped shadow along the curved margin. This contrasts with posterior shadowing, which appears behind a highly attenuating object, and with acoustic enhancement, which makes tissues behind a low-attenuation structure appear brighter. Ring tail isn’t a standard ultrasound term. Recognizing edge shadow helps distinguish curved-boundary effects from true pathology along the margins of rounded structures.

Edge shadow is the shadow artifact that arises at the edge of a curved boundary. When the boundary is rounded, the ultrasound beam is refracted at the edges and energy is directed away from the edge region, leaving a dark, wedge-shaped shadow along the curved margin. This contrasts with posterior shadowing, which appears behind a highly attenuating object, and with acoustic enhancement, which makes tissues behind a low-attenuation structure appear brighter. Ring tail isn’t a standard ultrasound term. Recognizing edge shadow helps distinguish curved-boundary effects from true pathology along the margins of rounded structures.