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Abstract #3289

An Integrated Unipolar Ultrasonic Gradient for Mitigating PNS and aliasing in accelerated silent MRI

Kaiqi Meng1, Michael McGrory1, Dennis Klomp1, Jeroen Siero1, Erik van Riel1, and Edwin Versteeg1,2
1Department of Radiology, University Medical Center Utrecht, Utrecht, Netherlands, 2Computational Imaging Group for MR diagnostics & therapy, Center for Image Sciences, University Medical Center Utrecht, Utrecht, Netherlands

Synopsis

Keywords: Gradients, Gradients, Non-linear gradient, PSF reconstruction, Ultrasonic, silent, acceleration

Motivation: In brain imaging with high-performance head-gradients, bipolar designs can lead to backfolding artifacts from the neck/shoulder regions. Additionally, the placement of one gradient pole near these areas increases the risk of PNS.

Goal(s): An ultrasonic unipolar-gradient coil was designed to address both aliasing artifacts and PNS in neck/shoulder area.

Approach: Tthe field-shape and acceleration performance were assessed by scanning a head-phantom with the unipolar-gradient coil.

Results: The 2-layer unipolar-gradient coil generated a magnetic field with an efficiency of 0.25 mT/m with a 10% deviation over 16 cm FOV. In phantom scans, the ultrasonic unipolar-gradient enabled up to 8-fold acceleration without any aliasing artefacts.

Impact: The presented ultrasonic unipolar gradient coil is designed to be plug-and-play and fit in an existing RF-transmit coil, ensuring ease-of-use while achieving a gradient-efficiency of 0.25 mT/m/A. The boost in gradient-performance can be used to yield fast and quiet scans.

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Keywords