Which statement best describes a multipath artifact causing lateral misregistration of a structure?

• A. Increased attenuation
• B. Refraction
• C. Diffraction
• D. Lateral misregistration due to multipath artifact

Answer: (D)

Multipath artifact occurs when echoes from a single structure reach the transducer via more than one path, which can make the system place the reflector in the wrong position, often appearing shifted to the side. The option that names both the cause (multipath artifact) and the effect (lateral misregistration) directly describes this phenomenon. Other choices point to different ultrasound effects—attenuation is about signal loss with depth, refraction can bend the beam but doesn’t specifically capture the misregistration caused by multiple paths, and diffraction describes wave bending in general but not the same misregistration mechanism. The best statement cleanly combines the cause and the resulting lateral displacement.