There is no radiation in abdominal ultrasound. Ultrasound works on the principle of sound waves, which are sound waves that exceed the range of what the human ear hears. Numerous studies have shown that diagnostic-grade ultrasound is not harmful to the human body, but some therapeutic-grade ultrasound can produce certain biological effects. Current ultrasound instruments are tested by FDA standards, including mechanical index, thermal index, etc. are within the normal safety range, and will not produce significant biological effects, nor cause cellular cavitation or significant cellular damage, which have been proven through a large number of experimental studies. Ultrasound and the usual familiar X-rays are different, the principle of X-rays is ionizing radiation, damage to cells, while ultrasound is a sound wave, diagnostic grade energy, mechanical index, thermal index, thermal effects are within the safe range, will not cause damage to the human body.