Ultrasound examination has a very small amount of radiation to the human body, similar to the radiation level of ordinary computers to the human body, if it is within the safe range and the contact time is short, the harm to the human body can be negligible, so the clinical opinion is that ultrasound examination has no radiation hazard. In fact, in daily life, all electrical equipment have radiation, generally electromagnetic radiation, including television, cell phones, hair dryers, etc., and ordinary B ultrasound and color ultrasound can also produce electromagnetic radiation, and the amount of radiation is very small, electromagnetic radiation to the human body is very small, do not affect the human body. In the case of ionizing radiation, such as X-ray, CT and radioactive radiation from nuclear power plants, the ionizing effect on cells in the body may lead to DNA denaturation, which is more risky. Therefore, ultrasound is one of the world’s most recognized non-invasive examinations, which so far has not been found to cause damage to the human body. Moreover, ultrasound has unique advantages in the examination process of abdominal organs and other organs, which cannot be replaced by other imaging methods. Because of its safety and ease of operation, it is also very suitable for pregnancy checkups, and pregnant women can be assured that they can cooperate with their doctors to complete their maternity checkups during pregnancy.