Many people have questions and complaints when they first start an ultrasound: “Doctor, is this a color ultrasound? I’m here for a color ultrasound, why is this all in black and white?” In everyone’s mind, color ultrasound and B-ultrasound are like color and black-and-white TV sets, where colorful images appear on the monitor is color ultrasound and black-and-white is B-ultrasound, and color ultrasound is color B-ultrasound. In fact, this is a misunderstanding of color ultrasound. The main difference between color ultrasound and B-ultrasound is not as simple as color TV and black and white TV. The so-called color ultrasound is short for color Doppler ultrasound, and B ultrasound is short for B-type ultrasound. Color ultrasound and B-ultrasound are two completely different instruments, not a simple color difference similar to that between a color TV and a black and white TV as one might imagine, and color ultrasound is not color B-ultrasound. The main technical indexes of color ultrasound such as (the number of probe wafers, the number of imaging channels, the dynamic range of imaging, the processing capacity and depth of the mainframe, etc.) are significantly higher than those of B ultrasound, so it can significantly improve the image resolution, which can detect smaller lesions at an earlier stage and improve the early diagnosis rate of diseases, and can display the details of the peripheral and internal changes of lesions more clearly and improve the accuracy of diagnosis. Color ultrasound has the function of color Doppler flow imaging, which can display the vascular anatomical structure, blood flow direction, blood flow speed and blood flow status changes in the lesion area, which can significantly improve the ability to identify the disease and improve the accuracy of diagnosis. Color ultrasound has the function of tissue harmonic imaging, which can obviously reduce obesity, gas and other artifact interference and improve image clarity. Color ultrasound has the function of contrast harmonic imaging, which can perform acoustic imaging and conduct more in-depth examination and study of lesions. Some color ultrasounds also have certain special functions, such as myocardial motion velocity analysis and four-dimensional imaging, which allow for more in-depth quantitative analysis of lesions. Therefore, color ultrasound examination can detect lesions at an earlier stage and can make more accurate differential diagnosis of lesions, significantly improving the accuracy of diagnosis, while the rate of missed diagnosis and misdiagnosis of B-ultrasound examination is significantly higher than that of color ultrasound. Every color ultrasound machine has the function of B-ultrasound, and usually, the doctor does “B-ultrasound” first and “color ultrasound” later. The doctor first uses the “ultrasound” function to observe the structure of organs and lesions, and then performs the “color ultrasound” examination afterwards, especially when a lesion is found. Especially when a lesion is found, “color ultrasound” can observe the distribution of blood vessels in and around the lesion and analyze several blood flow parameters such as the speed of blood flow, which is important for the characterization of the lesion.