Patent ID: 8660235

Claim:
A computed tomography apparatus, the computed tomography apparatus comprising: a radiation source for emitting a conical radiation beam for traversing an examination region of the computed tomography apparatus, a beam shaper for shaping the conical radiation beam, a detector for generating detection values depending on the conical radiation beam after having traversed the examination region, a weight providing unit for providing, for combinations of voxels of an image of the examination region and detection values, wherein each combination comprise a voxel and a detection value which corresponds to the voxel, weights for weighting the detection values, a reconstruction unit for reconstructing the voxels, wherein for reconstructing a voxel the reconstruction unit is adapted to weight the detection values, which correspond to the voxel to be reconstructed, with the weights provided for the combinations of the voxel to be reconstructed and the respective corresponding detection value, and to reconstruct the voxel from the weighted detection values, wherein the beam shaper is adapted to shape the conical radiation beam such that for at least a part of the detection values an average of the weights corresponding to the combinations of the voxels, which correspond to the respective detection value, and the respective detection value is positively correlated with the intensity of the respective part of the conical radiation beam, on which the respective detection value depends, before traversing the examination region.