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American Journal of Roentgenology, Vol 155, 1189-1193, Copyright © 1990 by American Roentgen Ray Society

ARTICLES

Value of increasing film processing time to reduce radiation dose during mammography

SE Skubic, R Yagan, D Oravec and Z Shah
Department of Radiology, MetroHealth Medical Center/Case Western Reserve University, Cleveland, OH 44109.

We systematically tested the effects on radiation dose and image quality of increasing the mammographic film processing time from the standard 90 sec to 3 min. Hurter and Driffield curves were obtained for a Kodak Min-R-OM1-SO177 screen-film combination processed with Kodak chemistry. Image contrast and radiation dose were measured for two tissue-equivalent breast phantoms. We also compared sequential pairs of mammograms, one processed at 90 sec and one at 3 min, from 44 patients on the basis of nine categories of image quality. Increased processing time reduced breast radiation dose by 30%, increased contrast by 11%, and produced slight overall gains in image quality. Simple modifications can convert a 90-sec processor to a 3-min unit. We recommend that implementation of extended processing be considered, especially by those centers that obtain a large number of screening mammograms. Three-minute film processing can reduce breast radiation dose by 30% and increase contrast by 11% without compromising image quality.
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Copyright © 1990 by the American Roentgen Ray Society.