1. A method for improving the image quality of a three-dimensional magnetic resonance image dataset recorded with a magnetic resonance device, the method comprising: deriving material parameters locally-resolved for a magnetic resonance device from at least one correction image dataset recorded with a modality other than the magnetic resonance device, registered with the magnetic resonance image dataset, showing at least partly a same recording region as the magnetic resonance image dataset; establishing a virtual magnetic resonance comparison dataset in a simulation using the material parameters; determining, as a function of a comparison between the magnetic resonance image dataset and the virtual magnetic resonance comparison dataset, at least one measure parameter describing an image quality improvement measure to be applied in a k-space; and applying the image quality improvement measure with the at least one measure parameter relating to the magnetic resonance image dataset.