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Abstract #3285

Safer Non-Cartesian Gradients for Your Subject and Scanner

Jiayao Yang1, Jon-Fredrik Nielsen1,2,3, and Yun Jiang2,3
1Department of Electrical Engineering and Computer Science, University of Michigan, Ann Arbor, MI, United States, 2Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI, United States, 3Department of Radiology, University of Michigan, Ann Arbor, MI, United States

Synopsis

Keywords: Gradients, Gradients

Motivation: High switching gradients can introduce peripheral nerve stimulation to subjects and create substantial Lorentz forces on gradient coils. Developing a method for gradient design with both of these constraints can potentially make the scan safer for both subjects and the scanner.

Goal(s): To develop a method for multidimensional gradient design with constraints of both PNS limits and mechanical resonance frequencies.

Approach: Formulate the gradient design problem as second-order cone programming with PNS limit and frequency constraints.

Results: Multidimensional gradient waveforms within PNS limits and frequency constraints were designed. We also applied the proposed method to design safer spirals and Rosettes.

Impact: Our simulation results demonstrated that our proposed method can constrain the PNS limits and requested energy in frequencies bands. We also showed the potential of design safer non-Cartesian trajectories for rapid imaging.

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