Whether children or adults, abdominal ultrasound is not dangerous, because the diagnostic ultrasound power is very low, and ultrasound is a non-invasive examination, neither trauma nor radiation.Ultrasound is the ultrasound through the body’s body surface into the body, and then the reflected wave through the ultrasonic diagnostic instrument for the conversion of acoustic and optical energy, and then form the diagnostic ultrasonic image, to provide the ultrasound doctor Diagnosis. Ultrasound is only a high-frequency sound waves, not rays, so there is no ionizing radiation, no harm to the human body.