Royalty free and rights managed images relating to the diagnostic technique of computed tomography (CT) scanning. X-rays are passed through the patient's body at different angles. A computer then produces a cross-sectional image of the tissue, and in some cases a 3D scan. This technique provides more detail than X-rays used by themselves. It also reduces the amount of dangerous radiation to which the patient is exposed. CT scans here include images of the brain (especially after a stroke), the heart and other organs. Photographs and pictures include patients in hospital in CT scanners, radiographers performing scans, and radiologists examining scans to diagnose diseases such as lung, liver and brain cancer.