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Silvia S Hidalgo-Tobon1, Martin Bencsik, Richard Bowtell

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biophysics
  • Medical Physics

Background:

  • Peripheral nerve stimulation (PNS) is a critical safety consideration in MRI.
  • Higher gradient slew rates (dG/dt) can improve image quality but increase PNS risk.
  • Optimizing gradient performance while maintaining safety is essential for advanced MRI applications.

Purpose of the Study:

  • To investigate methods for increasing the slew rate (dG/dt) at the PNS threshold.
  • To evaluate the impact of uniform concomitant fields on PNS thresholds.
  • To assess the feasibility of these methods without compromising imaging spatial extent.

Main Methods:

  • Development and testing of transverse and axial coil arrangements.
  • Application of uniform concomitant fields synchronized with gradient fields.
  • Volunteer studies (n=20) with body regions (head, heart, hips, knees) centered in coils.
  • Zero-field prototype system experiments without active coil shielding.

Main Results:

  • Synchronous application of uniform concomitant fields significantly increased dG/dt at the PNS threshold.
  • Transverse coils yielded larger increases in dG/dt compared to axial coils across body positions.
  • The observed increase in dG/dt varied by body position and coil type, with no significant reduction in imaging spatial extent.

Conclusions:

  • Uniform concomitant fields synchronized with gradient fields offer a viable strategy to increase dG/dt at the PNS threshold.
  • This approach can enhance MRI safety margins and potentially enable faster imaging sequences.
  • The effectiveness is dependent on coil configuration and body region, suggesting tailored approaches may be beneficial.