An ultrasound is a simple, painless and non-invasive imaging method for viewing structures within the body by producing real-time imaging. It is a good tool for guiding minimally invasive procedures, such as needle biopsies. Ultrasounds visualize structure, movement and live functions in the body's organs and blood vessels. In most situations, fasting is not necessary. With the aid of an ultrasound, often the need for exploratory surgery to obtain information can be avoided.