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Experimental implementation of array-compressed parallel transmission at 7 tesla.

Xinqiang Yan1,2, Zhipeng Cao1,3, William A Grissom1,2,3,4

  • 1Vanderbilt University Institute of Imaging Science, Nashville, Tennessee, USA.

Magnetic Resonance in Medicine
|April 16, 2016
PubMed
Summary
This summary is machine-generated.

This study successfully implemented a hardware system for array-compressed parallel transmission (acpTx), improving excitation accuracy. Future work will focus on remote tuning and reducing network power dissipation.

Keywords:
MR engineeringRF coilsRF pulse designarray compressionoptimizationparallel transmissionselective excitationultrahigh field MRI

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Area of Science:

  • Magnetic Resonance Imaging
  • Radiofrequency Engineering

Background:

  • Parallel transmission (pTx) systems utilize multiple transmit coils for improved imaging.
  • Array-compressed parallel transmission (acpTx) reduces the number of transmit channels required for a larger coil array.

Purpose of the Study:

  • To implement and validate a hardware-based array-compressed parallel transmission (acpTx) system.
  • To investigate the impact of coil coupling on power dissipation within the acpTx network.

Main Methods:

  • Developed a two-channel to eight-coil array compression network using power splitters, attenuators, and phase shifters.
  • Simulated coil coupling effects on power dissipation.
  • Constructed an eight-coil transmit array with induced current elimination decoupling.
  • Validated the system through benchtop measurements, B1+ mapping, and accelerated spiral excitation experiments.

Main Results:

  • Achieved attenuations within 0.08 dB of target values and reflection coefficients of -22 dB or better.
  • Simulation showed up to 3x higher power dissipation in the network with poorly isolated coils compared to well-isolated coils.
  • The acpTx network achieved 54% lower squared excitation error in spiral imaging compared to split circularly-polarized coil combinations.

Conclusions:

  • Successfully implemented a functional hardware acpTx system.
  • Identified the need for remote network tuning capabilities.
  • Highlighted the importance of minimizing network power dissipation for future development.