1. A stationary x-ray digital breast tomosynthesis system comprising: an field emission x-ray source that generates x-ray radiation from an array of spatially distributed x-ray focal spots configured to image a human breast from different viewing angles by electronically activating a corresponding array of spatially distributed field emission cathodes; an area x-ray detector configured to detect the projection images of the breast; an electronic controller for activating the x-ray radiation from the different x-ray focal spots in the x-ray source in a sequence and for synchronizing x-ray exposure from a given focal spot with image collection by the x-ray detector; and wherein tomography images of the breast are reconstructed using a plurality of projection images of the breast collected from different viewing angles without moving any of the x-ray source, the breast, or the x-ray detector.