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Fabrication and Characterization of Superconducting Resonators
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Active decoupling of RF coils using a transmit array system.

Ali Caglar Özen1,2, Michael Bock3, Ergin Atalar4

  • 1Department of Radiology, Medical Physics, University Medical Center Freiburg, 79106, Freiburg, Germany. ali.oezen@uniklinik-freiburg.de.

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Summary
This summary is machine-generated.

A new phase and amplitude (PA) decoupling method enables concurrent excitation and acquisition (CEA) MRI for samples with ultra-short T2* using clinical systems and parallel transmit arrays.

Keywords:
Concurrent excitation and acquisitionContinuous-wave NMRGeometrical decouplingPhase amplitude decouplingTransmit array

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Area of Science:

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

Background:

  • Concurrent excitation and acquisition (CEA) MRI offers potential for faster imaging.
  • Challenges exist in isolating transmit and receive radio frequency (RF) coils, especially for samples with ultra-short T2*.
  • Existing methods may not be sufficient for advanced MRI applications.

Purpose of the Study:

  • To implement and evaluate a novel phase and amplitude (PA) decoupling method for RF coil isolation in CEA MRI.
  • To enable CEA MRI in samples with ultra-short T2* using a clinical 3T-MRI system.
  • To assess the effectiveness of the PA decoupling method under various loading conditions.

Main Methods:

  • A clinical 3T-MRI system with a parallel transmit array was utilized.
  • A two-transmit coil and one-receive coil configuration was employed for RF excitation.
  • Geometric decoupling and PA adjustment of the second transmit coil minimized B1-induced voltages.
  • Isolation and transmit noise behavior were analyzed, with experiments conducted on a rubber phantom and ex vivo animal.

Main Results:

  • A total isolation of 70 dB was achieved through geometrical (20 dB) and PA decoupling (50 dB).
  • Integration of a low-noise RF amplifier was crucial for minimizing RF transmit noise.
  • Successful reconstruction of CEA MR images from both the rubber phantom and ex vivo animal samples was demonstrated.

Conclusions:

  • The developed PA decoupling method facilitates CEA MRI implementation on clinical platforms.
  • Parallel transmit array capabilities are essential for this advanced MRI technique.
  • Minor hardware modifications are sufficient for integrating this CEA MRI approach.