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Abstract #2406

k-Space Shift Correction Using an Alternating Gradient Readout Acquisition for Improved Radial Fat-Water MRI

Xuelin Cui1, John C. Gore2, E. Brian Welch2

1Biomedical Engineering, Vanderbilt university, Nashville, TN, United States; 2Radiology and Radiological Sciences, Vanderbilt University, Nashville, TN, United States

A primary challenge associated with the radial MRI sampling trajectory is the imperfect alignment of each sampled diagonal with the center of k-space. Gradient imperfections and timing delay errors cause the sampled trajectory to shift from the intended trajectory. Methods exist to align miscentered k-space samples for alternating radial readouts to the center of k-space by comparing neighboring radial lines that have nearly opposite readout direction. In this work, an alternating readout direction phase correction algorithm for radial MRI is tested on a conventional single gradient echo acquisition and a multiple fast field echo (mFFE) acquisition used for fat-water imaging.

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