1. An apparatus for acquiring off-axis X-ray images of a plurality of regions of interest, comprising: a source of radiation, the source producing a beam of radiation; a surface to support at least a subset of the plurality of regions of interest; and a X-ray detector located to simultaneously receive portions of the beam that have passed through the subset of the plurality of regions of interest, the X-ray detector producing from the received portions of the beam an electronic representation of an image for each region of interest in the subset of the plurality of regions of interest; wherein at least one of the source, the surface, and the detector may be moveable to position the regions of interest within the beam.