Nuclear Medicine Physicians are medical doctors who specialize in diagnosing and treating various diseases using radioactive substances. They use imaging techniques such as Positron Emission Tomography (PET) scans, which involve injecting a small amount of radioactive material into the patient's bloodstream to create detailed images of internal organs and tissues. These physicians also use nuclear medicine procedures to treat certain conditions, such as cancer or overactive thyroid glands. They work closely with other medical professionals, including radiologists and radiation oncologists, to provide comprehensive care for their patients.