Pediatric Radiology is the use of radiologic imaging used in diagnosing diseases in children. A pediatric radiologist is a physician who treats infants, children and adolescents by using medical imaging technologies to diagnose and sometimes treat disease. A diagnostic radiologist is a physician who may use tests such as X-rays, ultrasound, MRI (Magnetic Resonance Imaging), and a CT scan (Computed Tomography), to help diagnose and manage children’s diseases. A pediatric radiologist needs to be knowledgeable in children’s organ systems as they relate to growth and development, congenital malformations, and diseases specific to infants and children.