A portable radiography system, also known as a mobile X-ray unit, is a piece of equipment that can be moved to different locations to perform imaging tests. They are often used in hospitals, nursing homes, and other settings to provide imaging services without the need to transport patients to a radiology department. 
Portable radiography systems can be used in a variety of settings, including:
Hospitals
Mobile systems can be used in ERs and ICUs to perform rapid exams on unstable patients.
Nursing homes
Onsite imaging can reduce the stress of hospital trips for the elderly and reduce the risk of infection.
Pediatrics
Child-friendly mobile systems can help to reduce anxiety and fear for children.
Urgent care
Immediate imaging can help to speed up diagnosis and treatment of injuries and illnesses.
Specialty situations
Portability can be useful in confined spaces such as prisons, NICUs, homes, and disaster response areas. 
Portable radiography systems are equipped with wheels and a motorized drive that allow them to be moved around. They can use standard radiographic film or a plate with detectors that digitizes the image for display on a computer screen.