Color Doppler imaging is used to display what information about blood flow?

Color Doppler imaging is used to display what information about blood flow?

• A. Temperature changes
• B. Doppler frequency shifts
• C. Tissue stiffness
• D. Signal amplitude

Answer: (B)

Color Doppler imaging relies on the Doppler effect: moving blood cells change the frequency of the ultrasound waves that reflect back. The system detects those Doppler frequency shifts and translates them into color on the image, encoding both the speed and direction of blood flow. This is what lets you see how fast blood is moving and whether it’s traveling toward or away from the transducer. The other options describe properties that color Doppler doesn’t measure directly—temperature changes, tissue stiffness, or just the strength of the signal—so they don’t represent how color Doppler depicts blood flow.

Color Doppler imaging relies on the Doppler effect: moving blood cells change the frequency of the ultrasound waves that reflect back. The system detects those Doppler frequency shifts and translates them into color on the image, encoding both the speed and direction of blood flow. This is what lets you see how fast blood is moving and whether it’s traveling toward or away from the transducer. The other options describe properties that color Doppler doesn’t measure directly—temperature changes, tissue stiffness, or just the strength of the signal—so they don’t represent how color Doppler depicts blood flow.