Four-dimensional ultrasound examination, which is currently the most widely used means of ultrasound examination among the hospitals above the second level, has many advantages. First of all, through ultrasound to understand the specific situation of human organs, tissues and organs, which is also favorable to the current CT examination main method. At the same time, four-dimensional ultrasound examination is very high in clarity, can find more than 2mm substantial lesions, and have a clear judgment on the size, shape and nature of the disease. The four-dimensional color ultrasound examination is very convenient to use, basically about 3-4 minutes can understand the general situation of the corresponding disease, for the next step of the disease program development, provides an important imaging information to help. The cost of four-dimensional color ultrasound examination is also relatively low, also far better than the corresponding CT examination, MRI examination.