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Proceedings Paper

A Comparison Of Beam Filtration For Exposure Reduction In Radiographic Imaging
Author(s): Raymond P. Rossi; Carmine Plott; Charles Ahrens
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Paper Abstract

Three commercially available heavy element filters as well as more conventional filters of aluminum and copper were evaluated to determine their relative merit for the reduction of patient exposure in radiographic imaging. Specifically the filters were evaluated to determine reduction in x-ray tube exposure output and changes in beam quality, degree of entrance exposure reduction provided, associated increase in x-ray tube loading, and alteration of image contrast. The results indicate that a modest increase in aluminum filtration, above that which is required to provide the minimum beam quality requirements as specified by the Federal Performance Standard, will yield entrance exposure reductions of approximately 25 percent with x-ray tube load increases of from 5 to 10 percent. Further reduction in entrance exposure, on the order of 40 to 60 percent with associated x-ray tube load increases of less than 40 percent, may be achieved above 75 kilovolts by use of a composite filter of aluminum and copper, and two of the commercial filters. The third commercial filter, although providing significantly reduced entrance exposure, requires an unacceptable increase in x-ray tube load to obtain satisfactory image optical density. No significant changes in image quality were observed in images of either anatomical phantoms or a quantitative test object for any of the filters investigated.

Paper Details

Date Published: 1 May 1989
PDF: 11 pages
Proc. SPIE 1090, Medical Imaging III: Image Formation, (1 May 1989); doi: 10.1117/12.953229
Show Author Affiliations
Raymond P. Rossi, University of Colorado Health Sciences Center, School of Medicine (United States)
Carmine Plott, University of Colorado Health Sciences Center, School of Medicine (United States)
Charles Ahrens, University of Colorado Health Sciences Center, School of Medicine (United States)

Published in SPIE Proceedings Vol. 1090:
Medical Imaging III: Image Formation
Samuel J. Dwyer; R. Gilbert Jost; Roger H. Schneider, Editor(s)

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