In a method for image generation with an imaging modality, in particular a computed tomography system, in which measurement data for a sequence of 2D slice images of a subject volume are acquired with the imaging modality, image data for the 2D slice images are reconstructed from the measurement data and the image data are post-processed for generation and display of one or more secondary images, the post-processing and display is begun on the basis of already-reconstructed image data before all image data are completely reconstructed for the 2D slice images. The image data are initially reconstructed with a larger slice separation and are subsequently completed in a by a reconstruction of the entire subject volume with image data of remaining intermediate images, such that the representation of the one or more secondary images is completed by the post-processing of the image data of the intermediate images over time.