An ultrasound is carried out by a trained health professional (sonographer, radiologist or sonologist) using a smooth, hand-held device called a transducer that they move across the body with a sliding and rotating action. The transducer transmits the high-frequency sound waves into your body. Different sound waves are reflected from different soft tissue, structures or parts in the body in different ways. These sound waves are converted to electrical impulses that produce a moving image displayed on a screen.
An ultrasound has many advantages. It is painless and does not involve radiation, which means it is very safe. There are no injections unless your doctor has specifically requested one. The high-frequency sound waves ensure images show very high detail, capable of looking at the very tiniest parts of the body. Ultrasound can be carried out while there is movement, so it is excellent for the imaging of babies and children.