Technologic improvements in screen-film mammography.

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Abstract
During the past 20 years, many significant technologic improvements in mammographic x-ray equipment and screen-film processing systems have occurred. Today it is possible to obtain mammograms with higher image quality at a significantly lower radiation dose, compared with mammograms dating back about 20 years. In this review article, clinical image comparisons and technical information-including x-ray spectra, limiting geometric resolution, sensitometric characteristic curves, modulation transfer function, and noise power spectra-are used to demonstrate technologic improvements in mammographic image quality.