An imaging apparatus and related method comprising a source that projects a beam of radiation in a first trajectory； a detector located a distance from the source and positioned to receive the beam of radiation in the first trajectory； an imaging area between the source and the detector, the radiation beam from the source passing through a portion of the imaging area before it is received at the detector； a detector positioner that translates the detector to a second position in a first direction that is substantially normal to the first trajectory； and a beam positioner that alters the trajectory of the radiation beam to direct the beam onto the detector located at the second position. The radiation source can be an x-ray cone-beam source, and the detector can be a two-dimensional flat-panel detector array.
