Nuclear medicine exams assess the function of organs by using small amounts of radioactive material (radiopharmaceuticals) and a special camera to create images. The radiopharmaceutical is either taken by mouth or injected into the vein and is attracted to specific organs, bones or tissues. These areas of the body then emit gamma rays that are detected by the camera. Because nuclear medicine procedures are able to pinpoint molecular activity within the body, they offer the potential to identify disease in its earliest stages, as well as, a patient's immediate response to therapeutic interventions. Nuclear medicine imaging procedures are non-invasive. Radioactive emissions from the radiopharmaceutical are detected by a special camera or imaging device that produces pictures and provides molecular information for interpretation by a nuclear medicine radiologist.