A magnetic resonance imaging system that can acquire PSIR images with only half of the image time by using a new reconstruction technique. The system (1) includes a background phase unit (26), a phase correction unit (30), and an image correction unit (32). The background phase unit (26) constructs a background phase image from a received reconstructed phase image based on region growing of a selected homogeneous region by adding pixels within a phase difference criteria of the homogeneous region and adding inverted pixels outside the phase difference criteria. The phase correction unit (30) corrects the phase image with the background phase image to create a true phase image. The image correction unit (32) corrects a received reconstructed magnitude image based on the true phase image.
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