1. A method for correcting the density of an image comprising: (a) acquiring an image as a mask image; (b) acquiring at least one image as an injected image, after injecting a contrast agent into an object to be imaged; and (c) determining corrected images of the mask image and of the injected image from acquisition parameters of an apparatus that produces the image, from a composition of the imaged object and surroundings and from a composition of the injected contrast agent.