JOSH SHER / SCIENCE PHOTO LIBRARY JOSH SHER / SCIENCE PHOTO LIBRARY
Urography. Woman undergoing urogr- aphy, or pyelography, the production of X-rays of the urinary tract. The X-ray machine is seen above her abdomen. She has had an X-ray opaque contrast medium injected into a vein in her arm. Her kidn- eys will gradually filter the medium out of her blood and pass it along her ureters to her blad- der. X-rays are taken before and after the inject- ion. The woman has a urinary tract infection.
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