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X-ray imaging. Artwork of X-ray images on a male figure. X-ray images of his knee (lower centre), wrist (lower left), hip (centre), pelvis (centre), elbow (upper right) and shoulder (upper centre) are seen. A coloured X-ray (angiogram) of the heart is at upper left. At bottom left is a computed tomography (CT) scanner which uses X-rays to produce slice images of the body such as the head scan at upper left. Gamma camera scans of the liver (yellow/green) and a kidney (orange/red) are seen at centre. At centre right is an X-ray machine. Vital signs are visible on the screen at upper left and the computer at lower right. (KEYSTONE/SCIENCE PHOTO LIBRARY/LEONARD E. MORGAN, CUSTOM MEDICAL STOCK PHOTO)