Diagnostic ultrasounds are also known as ultrasound imaging, ultrasound scanning or sonography. During this non-invasive procedure, high-frequency sound waves are used to produce pictures of various parts of your body. Ultrasounds are different from X-rays in that they do not use radiation, and in that ultrasound images can be viewed in real time. Ultrasounds can also capture movement, such as showing blood flowing through blood vessels or the movement of internal organs.