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 <EOS>