1. An X-ray imaging system, the system comprising; an X-ray emitter configured to produce a first X-ray beam; a filter disposed to receive the first X-ray beam and output a second X-ray beam comprising, a higher-intensity beam portion and a tower-intensity beam portion, the filter comprising at least one filter leaf adapted to attenuate a portion of the first X-ray beam to produce the lower-intensity beam portion, the at least one filter leaf being adjustable to adjust at least one of an intensity of the lower-intensity beam portion and a geometry of the lower-intensity beam portion, the X-ray emitter and filter being arranged to direct the second X-ray beam toward an object; an X-ray receiver positioned to receive unabsorbed X-rays from the second X-ray beam, wherein the filter is disposed between the X-ray emitter and the X-ray receiver, the X-ray receiver configured to produce a plurality of projection images of the object from the received unabsorbed X-rays, each of the plurality of projection images comprising, a first region generated from the lower-intensity beam portion and a second region generated from the higher-intensity beam portion; and a processor in communication with the X-ray receiver, the processor adapted to execute computer readable code stored upon a computer readable medium, and upon execution of the computer readable code, to perform the steps of receiving the plurality of projection images from the X-ray receiver, and reconstructing a first three dimensional image based upon the plurality of projection images.