Which statement best describes Color Doppler?

Which statement best describes Color Doppler?

• A. Color Doppler shows speed and direction of blood flow by showing various color hues
• B. B-mode shows tissue density
• C. Spectral Doppler measures flow velocity over time
• D. Power Doppler maps tissue elasticity

Answer: (A)

Color Doppler encodes the velocity and direction of blood flow as color overlays on the gray-scale ultrasound image. Flow toward the transducer and flow away from it are shown with different colors, and the color scale reflects speed—the faster the flow, the more intense the color. This directly describes how Color Doppler communicates both how fast blood is moving and in which direction, which is its distinctive purpose. B-mode imaging, by contrast, shows anatomy and tissue density in gray scale and does not depict flow. Spectral Doppler provides a velocity waveform over time at a single location rather than a color map of the field. Power Doppler increases sensitivity to flow but does not convey direction, and it is not used to map tissue elasticity.

Color Doppler encodes the velocity and direction of blood flow as color overlays on the gray-scale ultrasound image. Flow toward the transducer and flow away from it are shown with different colors, and the color scale reflects speed—the faster the flow, the more intense the color. This directly describes how Color Doppler communicates both how fast blood is moving and in which direction, which is its distinctive purpose.

B-mode imaging, by contrast, shows anatomy and tissue density in gray scale and does not depict flow. Spectral Doppler provides a velocity waveform over time at a single location rather than a color map of the field. Power Doppler increases sensitivity to flow but does not convey direction, and it is not used to map tissue elasticity.