Color Doppler imaging is a specialized ultrasound technique used to visualize and assess blood flow within the body's blood vessels and organs. It builds upon the principles of traditional ultrasound by adding color-coded overlays to the grayscale images, allowing healthcare providers to visualize the direction and velocity of blood flow in real time.During a color Doppler ultrasound, sound waves are transmitted into the body using a handheld transducer. When these waves encounter moving blood cells, their frequency changes due to the Doppler effect. By analyzing these frequency shifts, the ultrasound machine creates color-coded maps that represent the speed and direction of blood flow.