1. A method comprising: emitting a respective imaging x-ray from each of a plurality of imaging x-ray sources disposed in a fixed relation with respect to one another by switching each x-ray source of the plurality of imaging x-ray sources at a different switching frequency, wherein at least one x-ray source of the plurality of imaging x-ray sources is switched at a peak switching frequency; acquiring x-ray absorption projections of an object, each of the x-ray absorption projections associated with an imaging x-ray emitted by a respective one of the plurality of imaging x-ray sources, wherein acquiring the x-ray absorption projections comprises sampling the degree of absorption of the x-rays by the object at a frequency less than or equal to one half times the peak switching frequency; and performing digital tomosynthesis using the x-ray absorption projections to generate a cross-sectional image of the object.