Method and apparatus for producing a three-dimensional reconstruction of a subregion of an object by means of a computed tomography apparatus

摘要

The present invention relates to a operating a computed tomography apparatus (1), wherein a three-dimensional reconstruction of a partial area (9) of an irradiated object (8) is produced, with a size of the partial area (9) of a plurality of different positions by means of x-rays (5, 5 ''), wherein the x-rays (5, 5'') also not to be reconstructed, adjacent areas (10, 10 '', 11, 11'') of the partial area (9) in said object (8), a recording of the respective transmitted individual intensities, a creation of a preliminary three-dimensional reconstruction of the partial area (9) from the individual intensities, a dividing the provisional reconstruction of the partial area (9) in part compartments (12, 13) with respective x-ray absorption properties, a determining respective corrections for the individual intensities and in particular, if the x-rays (5, 5 '') also adjacent areas (10, 10'', 11, 11 '') have penetrated, under the assumption that these adjacent areas (10, 10'', 11, 11 '') have predetermined absorption properties and a form of the three-dimensional reconstruction, taking into account the corrections and of the individual intensities, in order to achieve an improved three-dimensional reconstruction.