Color-flow Doppler studies can depict which of the following?

• A. Motion, Direction, and Velocity of blood flow through
• B. Color variation of tissue
• C. Electrical activity
• D. Tissue density

Answer: (A)

Color-flow Doppler visualizes moving blood by superimposing a color map onto the grayscale image. The color overlay shows that blood is moving (motion), indicates which direction the blood is flowing relative to the transducer (toward or away), and encodes how fast that flow is (velocity) through changes in hue and brightness. This combination lets you see flow through vessels, across valves, and identify abnormal patterns like stenosis or regurgitation. It doesn’t measure tissue color changes, electrical activity, or tissue density, which are assessed by other imaging or diagnostic methods.