In color Doppler imaging, the color arrow indicates what about flow?

In color Doppler imaging, the color arrow indicates what about flow?

• A. Flow toward the transducer
• B. Flow away from the transducer
• C. Turbulent flow
• D. Aliased flow

Answer: (A)

Color Doppler uses a directional marker to show the flow along the ultrasound beam relative to the transducer. The color arrow points in the direction the blood is moving with respect to the transducer. If the flow is toward the transducer, the arrow indicates that direction. This is the best answer because the arrow’s purpose is to convey flow direction, not to judge turbulence or aliasing. Turbulent flow appears as a multicolor mix rather than a single directional cue, and aliasing relates to exceeding the velocity range (Nyquist limit), not the arrow’s direction.

Color Doppler uses a directional marker to show the flow along the ultrasound beam relative to the transducer. The color arrow points in the direction the blood is moving with respect to the transducer. If the flow is toward the transducer, the arrow indicates that direction. This is the best answer because the arrow’s purpose is to convey flow direction, not to judge turbulence or aliasing. Turbulent flow appears as a multicolor mix rather than a single directional cue, and aliasing relates to exceeding the velocity range (Nyquist limit), not the arrow’s direction.