The invention relates to a computed tomography method in which an
examination zone is irradiated along a helical trajectory by a conical
radiation beam. The radiation transmitted by the examination zone is
measured by means of a detector unit and therefrom the absorption
distribution in the examination zone is reconstructed without
approximations. The reconstruction comprises a derivation of the
measuring values of parallel rays of different projections, an
integration of these values along K lines, a weighting of these values
and a back projection.