A computed tomography (or CT) scan is an imaging procedure that uses x-rays and digital computer technology to create detailed 3D images of the body.
While the patient lies on a bed (table), the CT scanner – which contains an x-ray source and detector - will rotate around the patient, collecting images of the body in multiple cross-sectional slices (imagine a loaf of sliced bread).
Powerful computers are then used to re-construct the slices into a detailed picture of the body part being scanned.
The CT scanner equipment consists of a large gantry (a supporting structure) with a circular hole. Inside the gantry is a rotating ring that carries the x-ray source and electronic x-ray detectors. An attached table slides the fully reclined person into the hole.