computed imaging method, a method for determining the location-dependent concentration of a number of predetermined substances in an examination subject, and the associated computer tomograph

摘要

Be it an improved computed imaging method as well as an associated computer tomograph (1) is specified. Accordingly, it is provided under irradiation of an examination subject (10) with polychromatic x-ray radiation (r) along a plurality of n projection vectors (d) projection images (p, p_i) the through the examination subject (10) transmitting x-ray radiation (r), and by means of a reconstruction algorithm on the basis of the projection images (p, p_i) a location-dependent attenuation coefficients (k (r, e_I)) of the examination subject (10) to calculate. In this case, the x-ray radiation transmitted (r) is detected and in an energy-sensitive manner by respective separate reconstruction of quasi - monoenergetic groups of projection images (p_i) a location-dependent spectral attenuation coefficient (k (r, e_i)) calculated.