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Color Doppler is a more advanced ultrasound technique. This video demonstrates that the color has been set to detect low flow states. With this setting engaged, the blood flow in the renal arteries and veins are enhanced with color. The areas that remain anechoic are the urinary collection system. This technique can help distinguish vasculature from dilated collecting systems. It is important to remember that red and blue indicate directionality and not the oxygenation status of the blood.