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Safe guidewire visualization using the modes of a PTx transmit array MR system.

Felipe Godinez1, Greig Scott2, Francesco Padormo3

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This study shows that using low-power maximum current modes with specific MRI sequences can safely visualize conductive guidewires during cardiac interventions. This offers a promising method for improved interventional MRI.

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auxiliary PTx systemcardiac cathetersguidewire visualizationinterventional MRI catheterizationinvasive hemodynamicsmedical device heatingparallel transmit MRIreal-time MRI

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Area of Science:

  • Medical Imaging
  • Biophysics
  • Cardiovascular Interventions

Background:

  • Standard metal guidewires in MRI-guided interventions risk tissue heating from radiofrequency currents.
  • Parallel transmit radiofrequency coils in null current mode enable safe tissue visualization but not guidewire imaging.

Purpose of the Study:

  • To investigate using maximum current modes at low power for visualizing conductive guidewires.
  • To identify optimal MRI pulse sequences for this application.

Main Methods:

  • Evaluated spoiled gradient echo, balanced steady-state free precession, and turbo spin echo sequences.
  • Tested guidewire visualization in a gel phantom using maximum current modes at low power.
  • Monitored guidewire tip temperature for safety.

Main Results:

  • Excellent guidewire visualization was achieved with maximum current modes, particularly using turbo spin echo.
  • Reduced pulse amplitude to 0.01% power prevented detected heating.
  • Null current mode provided background tissue visualization without heating.

Conclusions:

  • Parallel transmit technology offers a flexible approach for both guidewire (maximum current mode) and tissue (null current mode) visualization in cardiac MRI.
  • Instantaneous mode switching allows for seamless integration into interactive interventional sequences.