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Abstract #1337

A Low Inductance Nonlinear Gradient Array Design to Mitigate PNS and Reduce Voltage for Extension to Ultrasonic Whole-Body Fast and Silent MRI

Erik P M van Riel1, Michael J B McGrory1, Thomas Roos1, Kaiqi Meng1, Dennis W J Klomp1, Jeroen C W Siero1,2, and Edwin Versteeg1,3
1Radiology, UMC Utrecht, Utrecht, Netherlands, 2Spinoza Center for Neuroimaging, Amsterdam, Netherlands, 3Computational Imaging Group for MR diagnostics & therapy, UMC Utrecht, Utrecht, Netherlands

Synopsis

Keywords: Gradients, Gradients, Nonlinear gradient, PSF reconstruction, Silent, Ultrasonic, Acceleration

Motivation: A nonlinear gradient has the potential to facilitate whole-body ultrasonic silent encoding at 20 kHz while avoiding PNS. Yet, high voltage concerns at 20 kHz switching limits the maximum number of windings possible in a nonlinear gradient design.

Goal(s): To demonstrate encoding with a nonlinear gradient field produced by a gradient-array design.

Approach: We designed a prototype nonlinear gradient-array and imaged a phantom at 20 kHz. Data was reconstructed using a PSF-based method.

Results: The gradient-array enabled a nonlinear gradient shape to be generated with lower inductance than is possible with a single series circuit, reducing the induced voltage.

Impact: Whole-body silent MRI is necessary to improve patient comfort. Here, we show a nonlinear gradient-array is a viable option to avoid PNS while achieving ultrasonic switching rates. This suggests whole-body fast and silent MRI is possible with a gradient-array design.

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Keywords