Magnetic resonance method and apparatus to reduce distortions in diffusion imaging

A magnetic resonance apparatus for generating a diffusion-weighted magnetic resonance image that is substantially free of image distortions, comprising

• a magnetic resonance data acquisition unit;
• a control unit is configured to operate said magnetic resonance data acquisition unit to obtain a first adjustment magnetic resonance dataset of an examination subject in the magnetic resonance data acquisition unit by implementing a magnetic resonance data acquisition sequence with a first diffusion weighting in said magnetic resonance data acquisition unit;
• said control unit being configured to operate said magnetic resonance data acquisition unit to also obtain a second adjustment magnetic resonance dataset of the examination subject in the magnetic resonance data acquisition unit by implementing a magnetic resonance data acquisition sequence with a second diffusion weighting in said magnetic resonance data acquisition unit;
• said control unit being configured to operate said magnetic resonance data acquisition unit to obtain one of said first or second adjustment magnetic resonance datasets with a predetermined diffusion weighting in three orthogonal diffusion directions;
• and
• a processor provided with said first and second adjustment magnetic resonance datasets, said processor being configured to automatically calculate correction parameters, in each of said three orthogonal diffusion directions that de-skew diffusion weighted magnetic resonance images, and to make said correction parameters available at an output of said processor in a form allowing correction of a subsequently-obtained diffusion-weighted diagnostic magnetic resonance image with said correction parameters to substantially correct for image distortions arising due to the diffusion-weighting in said diagnostic magnetic resonance image.