MRI propeller with motion correction, water-fat separation and estimation of magnetic field inhomogeneity information

A magnetic resonance imaging system, the magnetic resonance imaging system comprising:

• at least one controller configured to:
• acquire magnetic resonance information on k-space lines for at least a first blade and separately for a second blade of a periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) imaging method for at least two of a plurality of slices;
• generate, main magnetic field inhomogeneity information separately for the first blade and the second blade based upon the acquired magnetic resonance information for the respective first and second blades, the main field inhomogeneity information indicating main field inhomogeneity within the main magnetic field for at least the first and second blades;
• generate water and fat image information individually for at least the first blade and separately for the second blade based only upon the acquired MR magnetic resonance information acquired for the respective blades and the generated main magnetic field inhomogeneity information for the corresponding blade of the first and second blades;
• correct at least one of the generated water and fat image information for spatial distortions caused by the generated main magnetic field inhomogeneity or a predetermined chemical shift difference between water and fat;
• and
• reconstruct at least one image based upon the generated corrected water and fat image information for at least the first and second blades.

A computer program stored on a computer readable non-transitory memory medium, the computer program configured to reconstruct images obtained from a magnetic resonance image system, the computer program comprising:

• a program portion configured to:
• acquire magnetic resonance information on k-space lines for at least a first blade and separately for the second blade of a periodically rotated overlapping parallel lines with enhanced reconstruction (PROPELLER) imaging method for at least two of a plurality of slices;
• generate main magnetic field inhomogeneity information separately for the first blade and the second blade based upon the acquired magnetic resonance information, the main field inhomogeneity information indicating inhomogeneity within the main magnetic field for at least the first and second blades;
• generate water and fat image information for at least the first blade and separately for the second blade based only upon the acquired magnetic resonance information for the respective blades and the generated main magnetic field inhomogeneity information for the corresponding blade of the first and second blades;
• correct at least one of the generated water and fat image information for spatial distortions caused by the generated main magnetic field inhomogeneity or a predetermined chemical shift difference between water and fat;
• and
• save the at least one of the generated corrected water and fat image information in a memory.