Patent ID: 7596202

Claim:
An imaging method comprising the steps: a) generating a projection data record of an examination area to be reconstructed by acquiring projections from different projection directions, wherein a projection direction is allocated to each projection and a projection geometry is allocated to each projection direction, b) providing an iteration operator that is dependent on a first projection direction, a second projection direction and a filter operator allocated to the second projection direction, and determining, in each case, a filter operator for each projection direction, the filter operators being adapted such that an averaging over all iteration operators, that have the same first projection direction but different second projection directions, substantially produces an identity operator and in which, on application of the iteration operator to a projection the following operations are carried out: back projection of the projection in a projection geometry, which is allocated to the first projection direction, forward projection of the back-projected values in a projection geometry, which is allocated to the second projection direction, filtering the forward-projected values with a filter operator of the second projection direction, back projection of the filtered values in a projection geometry, which is allocated to the second projection direction, forward projection of the filtered, back-projected values in a projection geometry which is allocated to the first projection direction, c) reconstruction of an image of the examination area from the projections with the aid of a filtered back projection, in which the filter operator of the corresponding projection direction is applied to each projection.