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Abstract #5544

Inline Adaptive Spiral Off-Resonance Correction for MRI-guided interventions

Matthew Restivo1, Michael Hansen1, Hui Xue1, and Adrienne Campbell-Washburn1

1Biochemistry and Biophysics Center, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, United States

Spiral imaging is appealing for MRI-guided interventions due to the need for high frame rate dynamic imaging and low RF power sequences to reduce RF-induced heating in metallic guidewires. Unfortunately, spiral images are susceptible to image distortions due to off-resonance which must be corrected. In this work, we implement a real-time interactive spiral sequence and a fast reconstruction in the Gadgetron that performs inline off-resonance correction that adapts to slice position and orientation changes. We show the effectiveness of our correction in both phantom and in-vivo volunteer images with reconstruction times that are approaching real-time.

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