Refraction is most likely observed in which view during sonography?

• A. Specular Reflector
• B. Perpendicular Incidence
• C. Curved Interface
• D. Rayleigh Scattering

Answer: (C)

Refraction in ultrasound happens when a beam crosses an interface between two tissues with different speeds at an angle other than perpendicular. A curved interface presents many points with different angles to the incoming beam, so the wave bends as it passes into the second medium. This bending can cause artifacts like mis registration or apparent displacement of structures along the curved boundary. If the incidence were perpendicular, there’d be no angular change, so refraction is unlikely; a specular reflector mainly reflects the beam without bending, and Rayleigh scattering is about scattering from small particles, not refraction at an interface. Thus, a curved interface is the scenario where refraction is most likely observed.