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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