ZEPHYR / SCIENCE PHOTO LIBRARY ZEPHYR / SCIENCE PHOTO LIBRARY
Voiding cystourethrogram. Three coloured X-rays showing a 65 year old patient undergoing a voiding cystourethrogram. This procedure involves liquid containing a radio-opaque dye being placed in the bladder via a urinary catheter (left). The bladder is then X-rayed as the patient empties the bladder (centre and right). It is used to diagnose vesicoureteral reflux, the backwards flow of urine from the bladder to the kidneys.
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