1. A method for generating phase-specific reconstructions, comprising: acquiring a plurality of projection images by moving an X-ray source about an imaging volume such that the X-ray source moves approximately 180 degrees; generating a plurality of phase-specific reconstructions in which anatomical structures imaged by a detector covering less than a full field of view are not present, wherein each phase-specific reconstruction is generated based on at least a subset of the plurality of projections acquired at or near the respective phase; generating a plurality of motion estimates based upon the plurality of phase-specific reconstructions; and generating one or more motion-corrected reconstructions, wherein each motion-corrected reconstruction is generated based on at least one respective motion estimate and on a corresponding subset of the plurality of projections.