K-t GRAPPA magnetic resonance imaging

The MRI apparatus includes a data processor, which time-serially performs undersampling on MR signals respectively received by coil channels included in a radio frequency (RF) multi-coil to acquire undersampled K-t space data, and an image processor that acquires a time-space correlation coefficient, based on noise information of the coil channels, and restores pieces of unacquired line data from the undersampled K-t space data by using the time-space correlation coefficient to acquire restored K-t space data, thereby increasing an accuracy of the time-space correlation coefficient to improve a quality of an image.