A radiotracer is a small amount of radioactive material used in medical imaging and research. It helps doctors and scientists visualize processes within the body, such as blood flow or organ function, by emitting radiation that can be detected by special cameras. This technique is commonly used in procedures like PET scans and SPECT imaging. Radiotracers are typically injected into the body, ingested, or inhaled, depending on the type of study being conducted. They are designed to target specific organs or tissues, allowing for detailed images and information about the body's internal workings. Safety measures are in place to minimize radiation exposure to patients.