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An 8 channel parallel transmit system with current sensor feedback for MRI-guided interventional applications.

Felipe Godinez1,2,3, Raphael Tomi-Tricot4, Bruno Quesson5

  • 1School of Biomedical Engineering and Imaging Sciences, King's College London, London, United kingdom.

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This study introduces a parallel transmit (pTx) system for MRI, enhancing safety for cardiac interventions by mitigating radiofrequency (RF) heating of guidewires in real-time.

Keywords:
Hilbert transformMR safetyMRI guided interventionsaddon PTx systemguidewireparallel transmit MRIvector modulation

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Area of Science:

  • Magnetic Resonance Imaging (MRI)
  • Biomedical Engineering
  • Medical Devices

Background:

  • Parallel transmit (pTx) MRI offers benefits like reduced specific absorption rates and improved transmit field homogeneity, especially at higher magnetic fields.
  • pTx can mitigate dangerous radiofrequency (RF) induced heating in conductive devices, crucial for cardiac interventional procedures.
  • Conventional MRI scanners can be augmented with pTx systems to adjust RF channel amplitude and phase for enhanced safety.

Purpose of the Study:

  • To present a novel system augmenting conventional MRI scanners with parallel transmit (pTx) capabilities.
  • To focus on enhancing guidewire safety during interventional MRI procedures.
  • To enable real-time adjustment of RF shims for mitigating RF-induced heating.

Main Methods:

  • An 8-channel add-on pTx system was designed for in-line operation with a 1.5 T MRI scanner.
  • The system utilized RF transmit signals, unblanking pulses, and scanner triggers for control.
  • Performance was evaluated through real-time RF current control on guidewires, heating mitigation tests, and anatomical imaging in sheep.

Main Results:

  • The pTx system demonstrated real-time determination of safe RF shims, even with guidewire movement.
  • Heating mitigation was achieved, ensuring guidewire safety during MRI procedures.
  • High-quality anatomical imaging of cardiac and surrounding structures was obtained with the pTx system integrated.

Conclusions:

  • A real-time feedback control pTx system was successfully designed and implemented.
  • This system enhances conventional MRI scanners with pTx capabilities for interventional applications.
  • The primary application demonstrated is improved safety for guidewire imaging in cardiac interventional MRI.