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Gradient system providing continuously variable field characteristics.

Ralph Kimmlingen1, Matthias Gebhardt, Johann Schuster

  • 1Physics Institute EP5, University of Würzburg, Würzburg, Germany. ralph.kimmlingen@med.siemens.de

Magnetic Resonance in Medicine
|April 12, 2002
PubMed
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Peripheral nerve stimulation in MRI can be overcome by a novel gradient system. This system allows for higher gradient performance without causing stimulation, improving MRI safety and capabilities.

Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Gradient Coil Design

Background:

  • Peripheral nerve stimulation (PNS) limits the performance of current MRI gradient systems.
  • High slew rates and gradient strengths are restricted to avoid patient discomfort and potential safety issues.

Purpose of the Study:

  • To develop and evaluate a novel gradient system capable of high performance without inducing peripheral nerve stimulation.
  • To enable the full potential of MRI gradient systems for improved imaging.

Main Methods:

  • A modular six-channel gradient coil system was designed using a modified target field method.
  • Two three-channel amplifiers and a six-channel gradient controller were employed.
  • Parallel driving of two coils on a single gradient axis was investigated.

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Main Results:

  • The new system achieved high performance (slew rate 190-210 T/m/s, G(max) 32-40 mT/m) without stimulation.
  • Parallel coil driving did not significantly degrade image quality.
  • Field properties and stimulation thresholds were successfully scaled and verified in phantom and volunteer studies.

Conclusions:

  • The developed gradient system effectively mitigates peripheral nerve stimulation.
  • This advancement allows for higher MRI gradient performance, enhancing diagnostic capabilities.
  • The system offers a pathway to safer and more powerful MRI examinations.