G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 33/56 (2006.01) A61B 5/055 (2006.01) G01R 33/567 (2006.01) G06F 17/00 (2006.01)
Patent
CA 2447724
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 indicative of at least an image of an object is received. Each set corresponds to one row k x of a k -space matrix of at least a k -space matrix. For each set a k -space matrix of the at least a 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. In a following step a location within the allocated k -space matrix corresponding to a row of the k -space matrix allocated thereto is determined for each set. At least a k -space matrix is then generated by re- arranging the plurality of sets. Each of the at least a k -space matrix comprises the sets of the plurality of sets of the MRI measurement data allocated thereto. Inverse Fourier transforming of the plurality of k -space matrices provides at least a reconstructed image. Through careful selection of the phases of the cardiac and respiratory cycles and corresponding ranges MRI data acquisition periods are of the order of seconds or a few minutes. Furthermore, integration of motion artifact free MRI images of different phases of organ motion using the coherent k -space synthesis according to the invention allows 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 tracked during the MRI data acquisition process. The motion artifacts are then corrected based on coherent k space synthesis using the motion vector data.
Dhanantwari Amar
Freibert Andreas
Stergiopoulos Stergios
Wrobel Miroslaw
Younis Waheed
Freedman & Associates
Her Majesty In Right Of Canada As Represented By The Minister Of
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