Patent Document ID: 20050238133
Application ID: 10524422
Patent Status: 0

Claim One:
1. An apparatus for generating images a subject on the basis of 3D-constructions from 3D-XRAY or 3D-computer Tomography measurements, which subject comprises both natural tissue and one or more high-density objects, said apparatus comprising a measuring facility for executing said measurements, a distinguishing facility for distinguishing said one or more high-density objects and executing a separating procedure thereon for generating an image of regions of said natural tissue, said apparatus being comprising: a ramp-filtering facility for applying a ramp filter in the direction of rotation to such various projection measurements and a back-projecting facility fed by said ramp-filtering facility for back-projecting the various so filtered projections into a 3D-volume reconstruction; a segmenting facility fed by said back-projecting facility for in said 3D-volume reconstruction segmenting said one or more high-density objects by a thresholding procedure and a forward projecting facility fed by said segmenting facility for executing a forward projection of the shadow(s) of the segmented one or more high-density objects onto the ramp-filtered projection, whilst marking the borders of said one or more high density objects in the ramp-filtered back-projections; a suppressing facility fed by said forward projecting facility for suppressing said reconstructed one or more high-density objects from the original projection measurements and said suppressing facility is operative for executing an appropriate substitution of gray values derived from a physical neighbourhood of said one or more high-density objects instead of said one or more high-density objects in question; and a retro-coupling facility fed by said suppressing facility for executing a back-projection of the various filtered projections with corrected profiles through exclusion of said suppressed one or more high-density objects and outputting a reconstruction result.