A computerised tomography (CT) scan uses X-rays and a computer to create detailed images of the inside of the body, and the cross-sectional images generated during a CT scan can be reformatted in multiple planes, and can even generate three-dimensional images. CT images of internal organs, bones, soft tissue and blood vessels typically provide greater detail than traditional x-rays, particularly of soft tissues and blood vessels. Due to the efficacy of the technique, usage of CT has increased dramatically over the last two decades.
NHS
Brain & Spine Foundation: CT scans
Cancer Research UK: CT scan