Patent ID: 7668289

Claim:
A computer tomography apparatus for examination of an object of interest, the computer tomography apparatus comprising: a detector element segmented into a plurality of sub-pixels, the plurality of sub-pixels including at least a first sub-pixel and a second sub-pixel; a first counting channel and a second counting channel associated with the first sub-pixel, the first counting channel corresponding to a first x-ray energy threshold and the second counting channel corresponding to a second x-ray energy threshold, which is dependent on first lowest and highest x-ray energies of interest for the first sub-pixel; and a third counting channel and a fourth counting channel associated with the second sub-pixel, the third counting channel corresponding to a third x-ray energy threshold and the fourth counting channel corresponding to a fourth x-ray energy threshold, which is dependent on second lowest and highest x-ray energies of interest for the second sub-pixel; wherein at least one of the first lowest x-ray energy of interest is different than the second lowest x-ray energy of interest or the first highest x-ray energy of interest is different than the second highest x-ray energy of interest.