Which method displays the average Doppler frequency shifts?

Which method displays the average Doppler frequency shifts?

• A. Spectral Doppler
• B. Pulse Doppler
• C. Color Doppler
• D. Power Doppler

Answer: (C)

Color Doppler shows the average Doppler frequency shifts by mapping the mean shift within each small region of tissue to a color on the image. This creates a real-time color overlay that conveys flow direction and relative speed, effectively representing the average velocity in that voxel. It focuses on a simplified, mean value rather than the full range of frequency shifts. In contrast, spectral Doppler displays the entire spectrum of Doppler shifts over time, showing the distribution of velocities rather than a single color-coded average. Power Doppler measures the strength or amplitude of the Doppler signal, not the shift itself. Pulse Doppler is the technique used to acquire the Doppler signal for spectral display.

Color Doppler shows the average Doppler frequency shifts by mapping the mean shift within each small region of tissue to a color on the image. This creates a real-time color overlay that conveys flow direction and relative speed, effectively representing the average velocity in that voxel. It focuses on a simplified, mean value rather than the full range of frequency shifts.

In contrast, spectral Doppler displays the entire spectrum of Doppler shifts over time, showing the distribution of velocities rather than a single color-coded average. Power Doppler measures the strength or amplitude of the Doppler signal, not the shift itself. Pulse Doppler is the technique used to acquire the Doppler signal for spectral display.