Ultrasound systems are diagnostic tools that generate x-ray images of the organs and tissues for making diagnosis. The science of sound waves underlies the operation of ultrasound equipment. The system emits sound waves, which, when they strike a body part or an organ, reflect and produce an image of that object on a detector. The instrument is mainly used to study developing fetuses (unborn children), abdominal and pelvic organs, muscles, tendons, and heart and blood arteries of humans.
Source: https://www.bharatbook.com/blog/demands-and-diagnoses-driving-the-india-ultrasound-systems-market