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A silent gradient axis for soundless spatial encoding to enable fast and quiet brain imaging.

Edwin Versteeg1, Dennis W J Klomp1, Jeroen C W Siero1,2

  • 1Department of Radiology, University Medical Center Utrecht, Utrecht, The Netherlands.

Magnetic Resonance in Medicine
|September 21, 2021
PubMed
Summary

A new silent gradient axis uses a 20 kHz oscillating gradient insert for fast and quiet brain imaging. This method enables artifact-free images with significantly reduced scan times, making MRI more accessible.

Keywords:
gradient coilgradient inserthigh gradient slew ratemagnetic resonance imagingperipheral nerve stimulationplug-and-playquietsilent

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Electrical Engineering

Background:

  • Conventional MRI gradient systems generate significant acoustic noise, limiting patient comfort and scan duration.
  • The development of quieter MRI technologies is crucial for improving patient experience and enabling new imaging applications.

Purpose of the Study:

  • To introduce a novel silent gradient axis for Magnetic Resonance Imaging (MRI).
  • To enable fast and quiet brain imaging by combining a 20 kHz oscillating gradient insert with slew rate-limited waveforms.

Main Methods:

  • A plug-and-play single-axis z-gradient insert was developed, resonating at 20 kHz using capacitors and an audio amplifier.
  • Gradient field characteristics and physiological effects (nerve stimulation, tissue heating) were assessed.
  • Modified 2D and 3D gradient echo (GRE) sequences were implemented and reconstructed using conjugate-gradient SENSE.

Main Results:

  • The silent gradient axis achieved a maximum gradient amplitude of 40.8 mT/m and slew rate of 5178 T/m/s at 20 kHz.
  • No limiting physiological effects were observed at these parameters; maximum sound levels were 85 dB(A).
  • 3D GRE imaging produced artifact-free images with a 5.3-fold reduction in scan time compared to fully sampled acquisitions.

Conclusions:

  • A silent gradient axis offers a viable method for achieving quiet and accelerated brain MRI.
  • This technology represents a significant advancement in MRI system design, enhancing patient comfort and diagnostic efficiency.