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Real-time device tracking under MRI using an acousto-optic active marker.

Yusuf S Yaras1, Dursun Korel Yildirim2, Daniel A Herzka2

  • 1George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Micromachined Sensors and Transducers Group, Atlanta, Georgia, USA.

Magnetic Resonance in Medicine
|December 21, 2020
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Summary
This summary is machine-generated.

This study introduces an active acousto-optic marker for improved MRI visibility and reduced radiofrequency (RF) heating during interventions. The novel marker enables real-time device tracking with enhanced safety and accuracy.

Keywords:
acousto-optic modulationactive devicescatheterfiber optic sensorinterventional MRIreal-time tracking

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Area of Science:

  • Medical Imaging
  • Biomedical Engineering
  • Materials Science

Background:

  • Interventional MRI requires precise device tracking.
  • Conventional active markers face challenges with radiofrequency (RF)-induced heating.
  • Enhanced visibility and reduced heating are crucial for patient safety and procedural success.

Purpose of the Study:

  • To demonstrate an "active" acousto-optic marker for interventional MRI.
  • To achieve enhanced visibility and reduced RF-induced heating.
  • To enable real-time tracking of medical devices.

Main Methods:

  • Fabrication of acousto-optic markers using piezoelectric crystal and fiber Bragg gratings (FBGs).
  • Coupling markers to receiver coils on catheters and transmitting signals via optical fiber to mitigate RF heating.
  • Characterization in phantom studies, RF-induced heating evaluation (ASTM 2182), and in vivo testing in an animal model at 0.55T.

Main Results:

  • Achieved signal-to-noise ratio (SNR) suitable for real-time tracking using high-sensitivity FBG and piezoelectric transducer.
  • Demonstrated real-time distal tip tracking of an active device in an animal model.
  • Significantly reduced RF-induced heating compared to conventional markers.

Conclusions:

  • Acousto-optic markers offer a simple, effective solution for real-time device tracking in MRI.
  • These markers significantly reduce RF-induced heating compared to conventional active markers.
  • Multiple RF receiver coils can be integrated for comprehensive catheter tracking (position, orientation, shape).