Radiology is a medical specialty that uses imaging technologies, such as X-ray radiography, magnetic resonance imaging (MRI), nuclear medicine, ultrasound, computed tomography (CT), and positron emission tomography (PET) to see within the human body in order to diagnose disease and abnormalities. A variety of imaging techniques such as X-ray radiography, ultrasound, computed tomography (CT), nuclear medicine including positron emission tomography (PET), and magnetic resonance imaging (MRI) are used to diagnose and treat diseases seen within the body. Interventional radiology is the performance of (usually minimally invasive) medical procedures with the guidance of imaging technologies.
The acquisition of medical images is usually carried out by the radiographer, often known as a radiologic technologist. Depending on location, the diagnostic radiologist, or reporting radiographer, then interprets or “reads” the images and produces a report of their findings and impression or diagnosis. This report is then transmitted to the clinician who requested the imaging, either routinely or emergently. Imaging exams are stored digitally in the picture archiving and communication system (PACS) where they can be viewed by all members of the healthcare team within the same health system and compared later on with future imaging exams.