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Abstract #2319

Real-time distortion correction of spiral MRI using the gradient system impulse response function

Adrienne E Campbell-Washburn 1 , Hui Xue 1 , Robert J Lederman 1 , Anthony Z Faranesh 1 , and Michael S Hansen 1

1 Division of Intramural Research, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland, United States

Spiral MRI is fast and low SAR, and therefore has potential utility for MR-guided interventions. To remove distortions in spiral MR images, gradient waveform imperfections must be corrected. In this abstract, the measured gradient system impulse response function is used to correct k-space trajectories in real-time for arbitrary image orientations and is demonstrated to remove image distortions in a phantom. In addition, an interactive off-resonance reconstruction is used to de-blur image regions of interest. In vivo, spiral imaging is performed with 10-15 frames/second. The introduction of these real-time distortion corrections will make spiral MR-guided interventions feasible.

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