BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY BIOPHOTO ASSOCIATES / SCIENCE PHOTO LIBRARY
Kidney angiogram. Coloured angiogram showing the blood vessels inside a normal human kidney. The large blood vessel in the lower centre is the renal artery, which provides the kidney with blood. The outline of the kidney is shown in purple. An angiogram is made by taking an X-ray after injecting the patient with a contrast medium (a substance opaque to X-rays). This angiogram was made from a healthy kidney that had been taken out of the body after the patient had died. Angiogr- graphy is usually used to look for diseases of the blood vessels, such as aneurysm (ballooning of an artery) or atherosclerosis (fatty deposits inside an artery).
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