Improved k-space trajectory measurement with signal shifting.: Improved k-Space Trajectory Measurement

Abstract : Various techniques for k-space trajectory measurement have been described in the literature. Self-encoding gradient techniques are time-consuming due to the high number of phase-encoding steps needed. The approach with localized slices is faster, but its use apparently has not been reported in the context of high spatial resolution experiments. Signals associated with high k-space frequencies may then reach low or even zero values, and this may result in errors in the estimate of the trajectories at the k-space periphery. To overcome this problem without increasing the measurement duration of the localized slice method too much, a new approach is proposed in which an addition dephasing gradient applied prior to the gradient to be measured shifts the signal maximum.
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Magnetic Resonance in Medicine, Wiley, 2007, 58 (1), pp.200-5. 〈10.1002/mrm.21254〉
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Marine Beaumont, Laurent Lamalle, Christoph Segebarth, Emmanuel Barbier. Improved k-space trajectory measurement with signal shifting.: Improved k-Space Trajectory Measurement. Magnetic Resonance in Medicine, Wiley, 2007, 58 (1), pp.200-5. 〈10.1002/mrm.21254〉. 〈inserm-00381455〉

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