Patent ID: 7361902

Claim:
A radiation detector comprising: a plurality of discrete detector elements arranged in a two-dimensional array, each of said detector elements comprising a scintillator and a photodiode interacting with said scintillator, each scintillator converting radiation incident thereon into light, said array having edges and allowing detection of said radiation, emitted from a focus, incident in a detector zone of said array, said radiation having scattered radiation associated therewith; and said detector elements in said array including a plurality of edge detector elements disposed at said edges of said array, the respective scintillators of only said edge detector elements each having an additional extent, compared to detector elements that are not disposed at said edges, said additional extent proceeding transversely with respect to the edge of the array, at which the edge detector element is located and making said edge detector elements larger than necessary for encompassing said detection zone, said detector elements in said array having, in combination, a total radiation-incident area that equals a total light-emitting area of said detector elements in said array, and the respective scintillators of said edge detector elements, in combination, forming a frame around said detection zone that absorbs said scattered radiation and that allows detection of said radiation emitted from said focus if a shift in position of said focus occurs.