Acquisition of magnetic resonance (MR) data in a predetermined three-dimensional volume segment of an examination subject with an MR apparatus proceeds by the volume segment being excited with an RF excitation pulse, and repeated, temporally sequential implementation of the following in order to respectively read out an echo train: Switch a refocusing pulse. Switch a first phase coding gradient in a first direction and a second phase coding gradient in a second direction. Switch an additional magnetic field gradient for spatial coding in a third direction which is perpendicular to the first direction and the second direction, wherein the MR data of a k-space line are read out while the additional magnetic field gradient is switched. Every k-space line corresponds to a line of k-space that corresponds to the volume segment. At least one k-space line is read out repeatedly in a middle segment of k-space.