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Driving mutually coupled gradient array coils in magnetic resonance imaging.

Koray Ertan1,2, Soheil Taraghinia1,2, Ergin Atalar1,2

  • 1National Magnetic Resonance Research Center (UMRAM), Bilkent University, Bilkent, Ankara, Turkey.

Magnetic Resonance in Medicine
|April 17, 2019
PubMed
Summary
This summary is machine-generated.

A new circuit model analytically calculates required voltages for mutually coupled gradient coil arrays in MRI. This enables precise control of magnetic field gradients, overcoming limitations of conventional systems.

Keywords:
MRIfeedforward modelgradient arraysgradient power amplifiersmutual couplingmutual inductancemutually coupled gradient array coils

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Electrical Engineering
  • Biomedical Engineering

Background:

  • Conventional MRI gradient systems face challenges with mutual coupling in gradient coil arrays.
  • Existing feedback loops in gradient amplifiers may not adequately predict or compensate for coupling effects.
  • Unknown voltage requirements for compensation can exceed amplifier limits.

Purpose of the Study:

  • To propose a first-order circuit model for gradient coil arrays with arbitrary spatial dependency.
  • To enable analytical calculation of required voltages for driving mutually coupled gradient coil arrays.
  • To determine minimum achievable rise times considering amplifier limitations.

Main Methods:

  • Developed a first-order circuit model incorporating mutual couplings between gradient coils.
  • Derived analytical formulas to calculate input voltages and minimum rise times.
  • Utilized a 9-channel Z-gradient coil array and custom gradient amplifiers for experiments.
  • Performed bench-top experiments with currents optimized for Z, Z2, and Z3 fields.
  • Validated the approach using linear Z-gradient as readout in 3T MRI.

Main Results:

  • Demonstrated current measurements for generating magnetic field profiles with minimal rise times.
  • Successfully generated a linear Z-gradient field with a specific time waveform using mutually coupled array coils in MRI.
  • Verified the simultaneous operation of 9-channel gradient coils and amplifiers.

Conclusions:

  • The proposed circuit model and analytical formulas are feasible for driving mutually coupled gradient coils.
  • Bench-top and MRI experiments confirm the model's effectiveness.
  • This approach enhances control and performance of gradient coil arrays in MRI systems.