Radiology is the science that uses medical imaging to diagnose and sometimes also treat diseases within the body. A variety of imaging techniques such as X-ray radiography, ultrasound, computed tomography (CT), and nuclear medicine including positron emission tomography (PET), and magnetic resonance imaging (MRI) are used to diagnose and/or treat diseases. Interventional radiology is the performance of (usually minimally invasive) medical procedures with the guidance of imaging technologies