Ultrasound is one sort of high frequency sound wave. Its frequency is higher than human hearing amount, around 20,000 Hz. using this; distinct organs of human body are seen as part of health diagnosis. In modern medical science use of 3d ultrasound auckland has become remarkably popular .At first in 1955 it was developed. After several evaluation from the research workers it proved to not be dangerous. For various functions this is used.
http://eastmedradiology.co.nz/our-services/ultrasound/