The working principle of the medical ultrasonic examination is similar to that of the sound, and the ultrasonic wave is launched to the human body. When it encounters the interface in the body, it will reflect and reflect, and it may be absorbed and attenuated in the human tissue. Because the forms and structures of various tissues of the human body are different, the degree of reflection and refraction and the degree of absorption of ultrasound is different. Doctors are identified they. In addition, combined with anatomy knowledge, normal and pathological changes, you can diagnose whether the organs that are checked by are sick.