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This study demonstrates an eight-channel transmit array for Magnetic Resonance Imaging (MRI). The system enables precise control of radio frequency (RF) fields for improved B1 field shimming and image quality.

Keywords:
B1 field pattern controlHigh field MRIcurrent elementnon-resonant structuretransmit phased arrayvolume coils

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Radio Frequency (RF) Engineering

Background:

  • High-field MRI faces B1 field inhomogeneity due to coil interactions and wavelength effects.
  • Radio frequency (RF) shimming can correct B1 inhomogeneity.
  • Transmit arrays with decoupled elements offer precise B1 field control.

Purpose of the Study:

  • To develop and evaluate an eight-channel transmit array for improved B1 field control in MRI.
  • To demonstrate non-iterative B1 field pattern control using decoupled transmit elements.

Main Methods:

  • Construction of an eight-channel transmit array with dedicated on-coil RF current sources per channel.
  • Setup of transverse electromagnetic (TEM) coil resonant modes via non-iterative coil current distribution.
  • Acquisition of 3T MRI images using a mineral oil phantom.

Main Results:

  • Replication of various linear and quadrature TEM coil resonant modes at 128 MHz without retuning.
  • Demonstration of independent control over current amplitude and phase for each transmit element.
  • Observed good agreement between generated B1 field patterns and simulations.

Conclusions:

  • The developed transmit array allows for simple and predictable B1 field shimming.
  • Independent control of transmit elements facilitates accurate B1 field pattern manipulation.
  • This technology enhances B1 field homogeneity in high-field MRI.