Abstract #0939

Simultaneous Estimation of Auto-calibration Data and Gradient Delays in non-Cartesian Parallel MRI using Low-rank Constraints

Wenwen Jiang¹, Peder E.Z Larson², and Michael Lustig³

¹Bioengineering, UC Berkeley/ UCSF, Berkeley, CA, United States, ²Radiology and Biomedical Imaging, UCSF, San francisco, CA, United States, ³Electrical Engineering and Computer Science, UC Berkeley, Berkeley, CA, United States

Gradient timing delay errors in non-Cartesian trajectories often induce spurious image artifacts. More importantly, misaligned k-space center data results in auto-calibration errors for parallel imaging methods. We propose a general approach that simultaneously estimates consistent calibration data and corrects for gradient delays. We pose the joint estimation problem as a low-rank minimization problem, and solve it using a Gauss-Newton method. We demonstrate the feasibility of the proposed method by simulation and phantom experiments.

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