Scanning equalization mammography: preliminary evaluation.

The authors show preliminary work with an experimental scanning equalization mammography system intended to increase contrast and achieve adequate dose throughout the breast. The unit uses a modulated, segmented fan beam. Tests with and without scanning equalization were performed with contrast-latitude phantoms and a breast specimen with superimposed microcalcifications. Films of varying contrast were evaluated. Contrast at low and very high object densities was greatly improved with the equalization technique. Microcalcifications were better appreciated, especially in those regions of the specimen that were outside the optimal optical density range of the conventional technique.