Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Reexamination Certificate
2005-05-17
2005-05-17
Shrivastav, Brij B. (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
C324S318000
Reexamination Certificate
active
06894494
ABSTRACT:
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 kxof 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.
REFERENCES:
patent: 4720678 (1988-01-01), Glover et al.
patent: 5329925 (1994-07-01), NessAiver
patent: 6289232 (2001-09-01), Jakob et al.
patent: 6353752 (2002-03-01), Madore et al.
patent: 6717406 (2004-04-01), Sodickson
Lenz et al; “Retrospective Cardiac Gating; A Review of Technical Aspects and Future Directions”; Magnetic Resonance Imaging; vol. 7, No. 5, Sep. 1989; pp. 445-455.
Bohning et al; “PC-Based System for Retrospective Cardiac and Respiratory Gating of NMR Data”; Magnetic Resonance in Medicine, Academic Press; vol. 16, No. 2, Nov. 1, 1990; pp. 303-316; ISSN: 0740-3194.
Dhanantwari Amar
Freibert Andreas
Stergiopoulos Stergios
Wrobel Miroslaw
Younis Waheed
Her Majesty the Queen in right of Canada as represented by the
Hunt, Jr. Ross F.
Shrivastav Brij B.
Stites & Harbison PLLC
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