Lumbar-vertebra magnetic resonance imaging method and apparatus, computer device, readable storage medium, and program product

A lumbar-vertebra magnetic resonance imaging apparatus, comprising:

• a sequence acquiring module configured to acquire a sequence for lumbar vertebrae in a magnetic resonance imaging process;
• the sequence comprising water-fat in-phase echo signals corresponding to different echo times, and the water-fat in-phase echo signals being collected when hydrogen protons of water and fat are in a same phase;
• an initial parameter estimating module configured to determine an initial transverse relaxation rate map corresponding to the lumbar vertebrae and an initial field map representing inhomogeneity of a static magnetic field applied to the lumbar vertebrae according to a signal intensity of each water-fat in-phase echo signal, the echo time of each water-fat in-phase echo signal, and a pre-constructed signal model;
• the signal intensity of the water-fat in-phase echo signal in the signal model being a signal determined jointly by the transverse relaxation rate map and the field map of the inhomogeneity of the static magnetic field at the moment when the hydrogen protons of the water and the fat are in the same phase;
• and
• a water-fat separating module configured to take the initial transverse relaxation rate map and the initial field map as initialization reconstruction parameters of water-fat separation, and reconstruct a water-fat separation image of the lumbar vertebrae.