Abstract #1236

Flexible use of AC/DC coil for eddy-currents and concomitant fields mitigation with applications in diffusion-prepared non-Cartesian sampling

Congyu Liao^1,2, Jason Stockmann³, Xiaozhi Cao^1,2, Zhitao Li¹, Lincoln Craven-Brightman³, Monika Sliwiak³, Charles Biggs³, Zheng Zhong¹, Nan Wang¹, Hua Wu⁴, Thomas Grafendorfer⁵, Fraser Robb⁵, Bernhard Gruber^3,6, Azma Mareyam⁷, Adam B Kerr^2,4, and Kawin Setsompop^1,2

¹Department of Radiology, Stanford University, Stanford, CA, United States, ²Department of Electrical Engineering, Stanford University, Stanford, CA, United States, ³Athinoula A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital and Harvard Medical School, Charlestown, MA, United States, ⁴Stanford Center for Cognitive and Neurobiological Imaging, Stanford University, Stanford, CA, United States, ⁵GE Healthcare, Milwaukee, WI, United States, ⁶BARNLabs, Muenzkirchen, Austria, ⁷Harvard Medical School, Charlestown, MA, United States

Synopsis

Keywords: Shims, ShimsThis work provides a demonstration that the AC/DC shim-array can be flexibly used to correct undesirable eddy-current and concomitant fields effect in MRI acquisitions, with simulation results showing its effectiveness at mitigating eddy-current induced phase in diffusion-prepared acquisition and in mitigating concomitant fields in non-Cartesian trajectories, such as spiral. Phantom and invivo experiments were also performed on a 46-channel AC/DC shim-array to demonstrate high-fidelity multi-shot 3D diffusion-prepared acquisition without need for SNR-zapping amplitude stabilizer.

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