X-ray exposure system for 3D imaging

Claim 1

An X-ray exposure system comprising: an X-ray source which emits an X-ray beam; an X-ray receiver on which said X-ray beam is incident; a carrier to which said X-ray source and said X-ray receiver are mounted; holder means to which said carrier is movably mounted for moving said X-ray source and said X-ray receiver relative to an examination subject for obtaining a plurality of successive 2D projections of said examination subject respectively from a plurality of different projection directions, each of said 2D projections having a unique projection geometry of the X-ray source and the X-ray receiver at a point in time at which that 2D projection is obtained, said carrier and said holder means having a mechanical instability associated therewith which precludes accurate identification at the projection geometry via said carrier and said holder means; at least one first transmission device mounted to as to be co-movable with said X-ray source, said at least one first transmission device emitting non-ionizing radiation; at least one second transmission device mounted so as to be co-movable with said X-ray receiver, said at least one second transmission device emitting non-ionizing radiation; a mount that is stationarily disposed relative to said X-ray source and said X-ray receiver and said holder means; at least one receiver device disposed at said mount for receiving said non-ionizing radiation from said at least one first transmission device and said at least one second transmission device, said at least one receiver device emitting an electrical signal corresponding to said non-ionizing radiation received by said at least one receiver device; and computer means supplied with said signal for identifying said respective projection geometries therefrom, and for calculating said plurality of 2D projections, and for reconstructing a 3D image of said examination subject from said plurality of 2D projections.