A magnetic resonance imaging system, the magnetic resonance imaging system comprising: - a memory storing machine executable instructions, first pulse sequence commands and second pulse sequence commands, wherein the first pulse sequence commands are configured to acquire identifying magnetic resonance data for identifying on a per voxel basis, whether the respective voxel is water or fat dominated, wherein the second pulse sequence commands are configured to acquire imaging magnetic resonance data, - a processor for controlling the magnetic resonance imaging system, execution of the machine executable instructions by the processor causing the processor to control the magnetic resonance imaging system to: - acquire the identifying magnetic resonance data using the first pulse sequence commands that are configured to acquire the identifying magnetic resonance data using an inversion recovery spin echo sequence, - acquire the imaging magnetic resonance data using the second pulse sequence commands, - use the identifying magnetic resonance data to determine on a per voxel basis, whether the respective voxel is water or fat dominated, and - reconstruct a magnetic resonance image using the imaging magnetic resonance data, wherein the determination on a per voxel basis whether the respective voxel is water or fat dominated is used as a constraint in the reconstruction of the magnetic resonance image from the imaging magnetic resonance data, and wherein the imaging magnetic resonance data comprise Dixon magnetic resonance data acquired using the second pulse sequence commands according to a Dixon magnetic resonance imaging protocol. - a memory storing machine executable instructions, first pulse sequence commands and second pulse sequence commands, wherein the first pulse sequence commands are configured to acquire identifying magnetic resonance data for identifying on a per voxel basis, whether the respective voxel is water or fat dominated, wherein the second pulse sequence commands are configured to acquire imaging magnetic resonance data, - a processor for controlling the magnetic resonance imaging system, execution of the machine executable instructions by the processor causing the processor to control the magnetic resonance imaging system to: - acquire the identifying magnetic resonance data using the first pulse sequence commands that are configured to acquire the identifying magnetic resonance data using an inversion recovery spin echo sequence, - acquire the imaging magnetic resonance data using the second pulse sequence commands, - use the identifying magnetic resonance data to determine on a per voxel basis, whether the respective voxel is water or fat dominated, and - reconstruct a magnetic resonance image using the imaging magnetic resonance data, wherein the determination on a per voxel basis whether the respective voxel is water or fat dominated is used as a constraint in the reconstruction of the magnetic resonance image from the imaging magnetic resonance data, and wherein the imaging magnetic resonance data comprise Dixon magnetic resonance data acquired using the second pulse sequence commands according to a Dixon magnetic resonance imaging protocol. - acquire the identifying magnetic resonance data using the first pulse sequence commands that are configured to acquire the identifying magnetic resonance data using an inversion recovery spin echo sequence, - acquire the imaging magnetic resonance data using the second pulse sequence commands, - use the identifying magnetic resonance data to determine on a per voxel basis, whether the respective voxel is water or fat dominated, and - reconstruct a magnetic resonance image using the imaging magnetic resonance data, wherein the determination on a per voxel basis whether the respective voxel is water or fat dominated is used as a constraint in the reconstruction of the magnetic resonance image from the imaging magnetic resonance data, and