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Radiology, Vol 127, 249-254, Copyright © 1978 by Radiological Society of North America

ARTICLES

Reduction of patient exposure by use of heavy elements as radiation filters in diagnostic radiology

JE Villagran, BB Hobbs and KW Taylor

The effect on patient exposure of x-ray filters made of heavy elements has been studied in excretory urography and lumbar spine examinations. Several elements with atomic numbers between 62 and 74 were tested in experiments using radiographic phantoms and in patient studies. A holmium filter reduced skin exposure by more than 50% in excretory urography. Similar results were obtained with ytterbium and tungsten in lumbar spine studies.


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