A scan is a medical procedure that uses imaging technology to create pictures of the inside of the body. It can be used to look for a variety of conditions, including cancer, heart disease and internal bleeding. Scans are also sometimes used to guide surgery or other treatments.
There are many different types of scans, each of which uses different technology. The most common types of scans are X-rays, computed tomography (CT) scans and magnetic resonance imaging (MRI) scans.
X-rays use high-energy waves to create images of the inside of the body. CT scans use special X-ray equipment and computers to create detailed 3D images of the inside of the body. MRI scans use strong magnets and radio waves to create detailed images of organs and tissues.
Scans are generally safe procedures with minimal risks involved. However, there is a small risk that exposure to ionising radiation from CT or X-ray scanning could cause cancer in some people. This risk is usually outweighed by the benefits of having a scan, such as early diagnosis and treatment of serious conditions.