Computer-implemented method for improving image quality in a time series of computed tomography image data sets, wherein - projection images of a recording region recorded in a recording procedure with different projection geometries are provided as a projection image series, - the projection geometries are at least described by a projection angle in a plane which is perpendicular to an axis of rotation, about which an X-ray source of a computed tomography facility used rotates along a recording trajectory, - the projection images in the recording procedure cover a total angular interval of at least 360° in their projection angles, and - first projection images of the projection image series recorded in each case consecutively in time are used to reconstruct the computed tomography image data sets, which projection images cover a partial angle interval of less than 360° in their projection angles, in particular of 180° or less, wherein, to reduce artefacts for each computed tomography image data set, - an interim dataset from the first projection images and a base dataset from second projection images of the projection image series which cover at least an angular interval of 360° are reconstructed using a modified parameterisation, which causes a greater weighting of lower spatial frequencies of a spatial frequency region that is covered in relation to at least one direction than in the case of the reconstruction of the computed tomography image data set, - a corrected base image data set in relation to the type of artefact is generated by applying a correction algorithm which models the recording procedure with respect to the first projection images and the reconstruction in order to reduce artefacts concerning at least one type of artefact and - the computed tomography data set is corrected by a correction data set, which describes artefacts and is determined by subtraction of the corrected base image data set from the interim data set, characterised in that the correction algorithm relating at least to cone beam artefacts as the type of artefact comprises: - determining a first model data set by way of forward projection and reconstruction starting from the base data set and relative to the projection geometries of the first projection images, - determining a second model data set by applying a low-pass filter or mapping the identity to the base data set, - determining an artefact data set by subtracting the second model data set from the first model data set, and - correcting the base data set by subtracting the artefact data set. - projection images of a recording region recorded in a recording procedure with different projection geometries are provided as a projection image series, - the projection geometries are at least described by a projection angle in a plane which is perpendicular to an axis of rotation, about which an X-ray source of a computed tomography facility used rotates along a recording trajectory, - the projection images in the recording procedure cover a total angular interval of at least 360° in their projection angles, and - first projection images of the projection image series recorded in each case consecutively in time are used to reconstruct the computed tomography image data sets, which projection images cover a partial angle interval of less than 360° in their projection angles, in particular of 180° or less, wherein, to reduce artefacts for each computed tomography image data set, - an interim dataset from the first projection images and a base dataset from second projection images of the projection image series which cover at least an angular interval of 360° are reconstructed using a modified parameterisation, which causes a greater weighting of lower spatial frequencies of a spatial frequency region that is covered in relation to at least one direction than in the case of the reconstruction of the computed tomography image data set, - a corrected base image data set in relation to the type of artefact is generated by applying a correction algorithm which models the recording procedure with respect to the first projection images and the reconstruction in order to reduce artefacts concerning at least one type of artefact and - the computed tomography data set is corrected by a correction data set, which describes artefacts and is determined by subtraction of the corrected base image data set from the interim data set, characterised in that the correction algorithm relating at least to cone beam artefacts as the type of artefact comprises: - determining a first model data set by way of forward projection and reconstruction starting from the base data set and relative to the projection geometries of the first projection images, - determining a second model data set by applying a low-pass filter or mapping the identity to the base data set, - determining an artefact data set by subtracting the second model data set from the first model data set, and - correcting the base data set by subtracting the artefact data set. - determining a first model data set by way of forward projection and reconstruction starting from the base data set and relative to the projection geometries of the first projection images, - determining a second model data set by applying a low-pass filter or mapping the identity to the base data set, - determining an artefact data set by subtracting the second model data set from the first model data set, and - correcting the base data set by subtracting the artefact data set.