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Color Doppler is an advanced imaging technique used in medical ultrasound to visualize and assess blood flow in the body's blood vessels and organs. It is an extension of conventional ultrasound imaging that adds color to the real-time ultrasound images, allowing healthcare professionals to evaluate blood flow direction, velocity, and characteristics.

The basic principle behind color Doppler imaging involves measuring the frequency shift (Doppler shift) of reflected sound waves from moving red blood cells. When blood cells move towards the ultrasound probe, the frequency of the reflected sound waves increases (positive Doppler shift). Conversely, when blood cells move away from the probe, the frequency decreases (negative Doppler shift).