Nuclear medicine uses a small amount of radioactive material to diagnose and sometimes treat diseases. Radiotracers are usually, but not always, given to a patient in the form of an intravenous injection. Images of where the radiotracer is in the body and how long it stays there are made using a special camera called a nuclear medicine gamma camera. These cameras work in conjunction with computers to form images that provide data and information about the areas of the body being imaged. The images generated can show if organs are working properly or not depending on if the radiotracers are absorbed by different tissue types, and at what rate or concentration they are absorbed.