The present invention relates to a method and a magnetic resonance system (5) for determining a t1 - time of water and an t1 - time of fat in a predetermined volume part of an examination subject (o). In this case, the process comprises the steps of:Switching of magnetic field gradient (gx) for generating a plurality of gradient echoes (34)Detection of first echoes (34) to at least two different echo times (tE1–TE3) starting from hf - pulses (31) with a first flip anglesDetermining a first water magnetization and a first fat magnetization per voxel of the volume portion as a function of the first echoes (34) according to the dixon - methodDetection of second echoes (34) to at least two different echo times (tE1–TE3) starting from hf - pulses (31) with a second flip anglesDetermining a second water magnetization and a second fat magnetization per voxel of the volume portion as a function of the second echoes (34) according to the dixon - method andDetermining the t1 - time of water and the t1 - time of grease per voxel as a function of the first water magnetization of the respective voxel of the first fat magnetization of the respective voxel, the first flip angle, of the second water magnetization of the respective voxel of the second fat magnetization of the respective voxel and the second flip angles.
