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Multilayer Gradient Coil Design

Bowtell1, Robyr

  • 1Department of Physics, University of Nottingham, University Park, Nottingham, NG7 2RD, United Kingdom

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|May 8, 1998
PubMed
Summary

Multilayer gradient coils overcome resistance limits in standard single-layer designs, enabling more powerful magnetic field gradients for advanced research. This innovation allows for higher efficiency and acceptable resistance values in gradient coil systems.

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Area of Science:

  • Magnetic Resonance Imaging
  • Coil Design Engineering

Background:

  • Standard single-layer cylindrical gradient coils face limitations in achieving high magnetic field gradients due to rapidly increasing coil resistance with efficiency.
  • This resistance increase is linked to the reduced maximum usable wire diameter as the number of turns escalates.

Purpose of the Study:

  • To develop a multilayer gradient coil design to overcome the resistance limitations of single-layer coils.
  • To enable the creation of more powerful gradient coils with acceptable resistance values for advanced applications.

Main Methods:

  • Extended existing theories for standard cylindrical gradient coils to derive mathematical expressions for multilayer coil design.
  • Designed and evaluated a four-layer, z-gradient coil with specific dimensions and performance characteristics.

Main Results:

  • Developed mathematical expressions for designing and evaluating multilayer gradient coils.
  • Designed an 8 mm inner diameter, four-layer z-gradient coil with 1.73 Tm-1 A-1 efficiency, 1.8 Ohm resistance, and 50 µH inductance.
  • The designed coil achieved less than 5% gradient linearity deviation within a 4.5 mm length and 4.5 mm diameter central region.

Conclusions:

  • Multilayer coil designs offer a favorable scaling of resistance with efficiency, allowing for more powerful gradient coils.
  • Experimental verification confirmed the predicted performance of the constructed multilayer coil, demonstrating its advantages for applications requiring very large magnetic field gradients.

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