Instead of film, CT scanners use special digital x-ray detectors, which are located directly opposite the x-ray source.
During a CT scan, the patient lies on a bed that slowly moves through the gantry while the x-ray tube rotates around the patient, shooting narrow beams of x-rays through the body.
Unlike a conventional x-ray-which uses a fixed x-ray tube-a CT scanner uses a motorized x-ray source that rotates around the circular opening of a donut-shaped structure called a gantry.
