How might sound waves be used in medicine?

One of the most common ways sound is used in medicine is the Ultrasound technique. This uses sound wave vibrations to create a picture of something inside the body without using X-rays, for example. Another way is that sound waves can be used to break things apart, such as gallstones or kidney stones. Kidney stones have to be urinated out, which can be extremely painful and even dangerous if they are large. Sound waves can be used to break the stones into smaller fragments while they're still inside the body.