CORRECTION OF ORGAN MOTION ARTIFACTS IN MRI SYSTEMS

摘要

The present invention relates to a signal processing method and system for correcting organ motion artifacts for cardiac and brain imaging. A plurality of sets of MRI measurement data for at least one image of an object is received. Each set corresponds to one row kX., of a k -space matrix of at least a k -space matrix. For each set a k -space matrix of the at least one k - space matrix is determined for allocation thereto based on motion information of the object occurring during acquisition of the plurality of sets of the MRI measurement data. At least one k -space matrix is then generated from the plurality of sets. Inverse Fourier transforming of the plurality of k -space matrices provides one reconstructed image. Motion artifact free MRI images of different phases of organ motion using the coherent k -space synthesis according to the invention allow provision of an animation showing different phases of a cardiac or lung cycle. In an embodiment for correcting motion artifacts for brain imaging a motion vector describing translational and rotational motion of a patient's head is tracking during the MRI data acquisition process. The motion artifacts are then corrected based on coherent k -space synthesis using the motion vector data.