Multiple reflections that are equally spaced are called:

Multiple reflections that are equally spaced are called:

• A. Refractions
• B. Shadows
• C. Reverberations
• D. Comets

Answer: (C)

Equally spaced multiple reflections are called reverberations. This artifact happens when the ultrasound beam bounces back and forth between two strong reflectors, producing a series of echoes at regular intervals along the image. The spacing of these echoes corresponds to the round-trip travel time between the reflectors and the speed of sound in tissue, so you see a ladder-like stack of lines. Reverberations commonly occur near interfaces with closely spaced boundaries, like between pleura and chest wall. A related pattern, comet-tail, is a narrow bright line with a tail and is sometimes considered a subtype of reverberation, but the general term for these evenly spaced echoes is reverberation. Refractions bend the beam and alter echo position, shadows are dark regions behind strong attenuators, and “comets” without context can refer to specific patterns but do not describe the general equally spaced echoes.

Equally spaced multiple reflections are called reverberations. This artifact happens when the ultrasound beam bounces back and forth between two strong reflectors, producing a series of echoes at regular intervals along the image. The spacing of these echoes corresponds to the round-trip travel time between the reflectors and the speed of sound in tissue, so you see a ladder-like stack of lines. Reverberations commonly occur near interfaces with closely spaced boundaries, like between pleura and chest wall. A related pattern, comet-tail, is a narrow bright line with a tail and is sometimes considered a subtype of reverberation, but the general term for these evenly spaced echoes is reverberation. Refractions bend the beam and alter echo position, shadows are dark regions behind strong attenuators, and “comets” without context can refer to specific patterns but do not describe the general equally spaced echoes.