Optimal design of <I>k</I>-space trajectories using a multi-objective genetic algorithm Export

@article{citeulike:3341219, abstract = {Spiral, radial, and other nonrectilinear k-space trajectories are an area of active research in MRI due largely to their typically rapid acquisition times and benign artifact patterns. Trajectory design has commonly proceeded from a description of a simple shape to an investigation of its properties, because there is no general theory for the derivation of new trajectories with specific properties. Here such a generalized methodology is described. Specifically, a multi-objective genetic algorithm (GA) is used to design trajectories with beneficial flow and off-resonance properties. The algorithm converges to a well-defined optimal set with standard spiral trajectories on the rapid but low-quality end, and a new class of trajectories on the slower but high-quality end. The new trajectories all begin with nonzero gradient amplitude at the k-space origin, and curve gently outward relative to standard spirals. Improvements predicted in simulated imaging experiments were found to correlate well with improvements in actual experimental measures of image quality. The impact of deviations from the desired k-space trajectory is described, as is the impact of using different phantoms. Magn Reson Med 52:831-841, 2004. {\copyright} 2004 Wiley-Liss, Inc.}, address = {Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio; Department of Radiology, University Hospitals of Cleveland, Cleveland, Ohio}, author = {Dale, Brian M. and Lewin, Jonathan S. and Duerk, Jeffrey L.}, citeulike-article-id = {3341219}, citeulike-linkout-0 = {http://dx.doi.org/10.1002/mrm.20233}, citeulike-linkout-1 = {http://www3.interscience.wiley.com/cgi-bin/abstract/109629896/ABSTRACT}, doi = {10.1002/mrm.20233}, journal = {Magnetic Resonance in Medicine}, keywords = {2004, acquisition, k-space, mrm, trajectory}, number = {4}, pages = {831--841}, posted-at = {2008-09-26 22:15:52}, priority = {5}, title = {Optimal design of <I>k</I>-space trajectories using a multi-objective genetic algorithm}, url = {http://dx.doi.org/10.1002/mrm.20233}, volume = {52}, year = {2004} }

TY - JOUR ID - citeulike:3341219 L3 - citeulike-article-id:3341219 N2 - Spiral, radial, and other nonrectilinear k-space trajectories are an area of active research in MRI due largely to their typically rapid acquisition times and benign artifact patterns. Trajectory design has commonly proceeded from a description of a simple shape to an investigation of its properties, because there is no general theory for the derivation of new trajectories with specific properties. Here such a generalized methodology is described. Specifically, a multi-objective genetic algorithm (GA) is used to design trajectories with beneficial flow and off-resonance properties. The algorithm converges to a well-defined optimal set with standard spiral trajectories on the rapid but low-quality end, and a new class of trajectories on the slower but high-quality end. The new trajectories all begin with nonzero gradient amplitude at the k-space origin, and curve gently outward relative to standard spirals. Improvements predicted in simulated imaging experiments were found to correlate well with improvements in actual experimental measures of image quality. The impact of deviations from the desired k-space trajectory is described, as is the impact of using different phantoms. Magn Reson Med 52:831-841, 2004. © 2004 Wiley-Liss, Inc. IS - 4 JF - Magnetic Resonance in Medicine AD - Department of Biomedical Engineering, Case Western Reserve University, Cleveland, Ohio; Department of Radiology, University Hospitals of Cleveland, Cleveland, Ohio EP - 841 TI - Optimal design of <I>k</I>-space trajectories using a multi-objective genetic algorithm VL - 52 SP - 831 KW - 2004 KW - acquisition KW - k-space KW - mrm KW - trajectory AU - Dale, Brian AU - Lewin, Jonathan AU - Duerk, Jeffrey PY - 2004/// UR - http://dx.doi.org/10.1002/mrm.20233 ER -