1. A multi-energy tomosynthesis imaging system, the system comprising: an X-ray source configured to emit X-rays at a plurality of locations within a limited angular range relative to an imaging volume; a digital detector comprising an array of detector elements, wherein the digital detector is configured to generate a plurality of images in response to the emitted X-rays; detector acquisition circuitry configured to acquire the plurality of images from the digital detector; and processing circuitry configured to decompose the plurality of images based on energy characteristics and to reconstruct the plurality of images to generate a three-dimensional multi-energy tomosynthesis image.