1.What is color ultrasound? Color ultrasound, full name color Doppler ultrasound, is a method of observing the internal blood flow of a target, which can significantly improve the diagnostic ability of doctors. 2.Why do I see the picture in black and white? As mentioned above, color ultrasound is a function and is not the same concept as a color television. The basis of ultrasound images is grayscale (black and white). Some machines have color images, but they are also monochrome – this is “pseudo-color” and not color ultrasound. A machine with color ultrasound capabilities is called a color ultrasound machine, which is much more upscale than a black and white machine and costs much more.