Power Doppler colorization shows what information?

Power Doppler colorization shows what information?

• A. Flow velocity
• B. Doppler signal amplitude
• C. Frequency shift
• D. Acoustic power

Answer: (B)

Power Doppler colorization encodes the strength of the Doppler signal (its amplitude or power), not how fast the blood is moving or in what direction. The color intensity reflects how strong the Doppler echoes are within the sampled tissue, which increases with more moving red blood cells and with a broader range of velocities, making it especially good at detecting low-velocity flow and small vessels. Because it focuses on signal strength rather than velocity, it does not provide flow speed or direction information. Flow velocity is what conventional color Doppler shows, frequency shift is what spectral Doppler measures, and acoustic power refers to the ultrasound beam’s transmitted intensity, not the Doppler signal colorization.

Power Doppler colorization encodes the strength of the Doppler signal (its amplitude or power), not how fast the blood is moving or in what direction. The color intensity reflects how strong the Doppler echoes are within the sampled tissue, which increases with more moving red blood cells and with a broader range of velocities, making it especially good at detecting low-velocity flow and small vessels. Because it focuses on signal strength rather than velocity, it does not provide flow speed or direction information. Flow velocity is what conventional color Doppler shows, frequency shift is what spectral Doppler measures, and acoustic power refers to the ultrasound beam’s transmitted intensity, not the Doppler signal colorization.