A galactography process in a mammograph for characterizing galactophorous ducts of a breast of a patient in which a contrast product has been previously injected is provided. The process comprises: emitting X-rays to the breast of a patient acquiring at least one first mammographic image with X-rays having a first energy acquiring at least one second mammographic image with X-rays having a second energy and processing the at least one first image and the at least one second image to produce an image of the concentration of the contrast product in the breast, wherein the first energy is different than the second energy.
