1. A x-ray breast imaging system comprising: a low x-ray dose breast imaging structure configured to image patients' breasts with an x-ray beam to provide one or more low-dose x-ray breast images each taken at an x-ray dose substantially below that for a standard mammogram and having image quality significantly below that of a standard mammogram; a computer-implemented processor configured to apply computer processing to the low-dose x-ray images, said processing using training with mammograms that have the image quality of at least a standard mamrnmogram, and thereby convert the low-dose x-ray images to one or more respective higher-quality images comparable in image quality to standard mammograms; and a display configured to display the one or more of the one or more higher-quality x-ray images of the breast.