Abstract #0624

MaxGIRF: Image Reconstruction Incorporating Maxwell Fields and Gradient Impulse Response Function Distortion

Nam G. Lee¹, Rajiv Ramasawmy², Adrienne E. Campbell-Washburn², and Krishna S. Nayak^1,3

¹Biomedical Engineering, University of Southern California, Los Angeles, CA, United States, ²Cardiovascular Branch, Division of Intramural Research, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, United States, ³Ming Hsieh Department of Electrical and Computer Engineering, University of Southern California, Los Angeles, CA, United States

Non-Cartesian imaging can suffer from local blurring caused by concomitant fields and off-resonance. Concomitant fields are especially problematic when using prolonged non-Cartesian readouts with high gradient amplitudes at lower field strengths. We present a new reconstruction method, denoted MaxGIRF, for non-Cartesian imaging that corrects concomitant fields and trajectory errors without specialized hardware. The proposed method utilizes gradient impulse response functions to predict gradients waveforms which are in-turn used to estimate concomitant fields with analytic expressions. Image artifacts were successfully mitigated by the proposed method from 2D SE spiral imaging of the human brain acquired on a prototype 0.55T MRI system.

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