Doppler frequency shift exhibits which feature in color Doppler interpretation?

• A. Aliasing
• B. Spectral broadening
• C. Narrow bandwidth
• D. Mirroring

Answer: (B)

The Doppler frequency shift in color Doppler is represented by a spread of velocities within the sampled volume. When there’s flow with a range of speeds (turbulence, bifurcations, or jetting), the Doppler shifts cover a wider spectrum, and the color display broadens rather than showing a single, uniform color. This widening of the velocity distribution is called spectral broadening, and it’s how the Doppler shift reveals complex flow patterns on color Doppler.

Aliasing would show up as a color wrap when velocities exceed the Nyquist limit, not as a broadening of the Doppler spectrum itself. Narrow bandwidth isn’t characteristic of the Doppler shift in this context, and mirroring is a separate artifact.