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Related Experiment Video

Updated: Feb 5, 2026

Non-fluoroscopic Catheter Tracking for Fluoroscopy Reduction in Interventional Electrophysiology
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Acousto-Optic Catheter Tracking Sensor for Interventional MRI Procedures.

Yusuf Samet Yaras, Sarp Satir, Cagla Ozsoy

    IEEE Transactions on Bio-Medical Engineering
    |September 7, 2018
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an acousto-optic optical fiber sensor for tracking catheter position during interventional magnetic resonance imaging (MRI). The novel sensor minimizes radiofrequency (RF) induced heating risks associated with active markers.

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    Area of Science:

    • Biomedical Engineering
    • Optical Sensing
    • Magnetic Resonance Imaging

    Background:

    • Interventional magnetic resonance imaging (MRI) requires precise tracking of catheters.
    • Active tracking markers in MRI are susceptible to radiofrequency (RF) induced heating.
    • Existing tracking methods pose risks and limitations in MRI environments.

    Purpose of the Study:

    • To develop and validate an acousto-optic optical fiber sensor for catheter tracking during interventional MRI.
    • To overcome the challenge of RF induced heating from active markers.
    • To provide a safer and more effective tracking solution.

    Main Methods:

    • A sensor was designed using a miniature coil, piezoelectric transducer, and optical fiber with a Fiber Bragg Grating (FBG).
    • Radiofrequency (RF) signals were converted to acoustic waves in the optical fiber, modulating the FBG.
    • Prototypes were tested in a 1.5 T MRI system and compared with active tracking markers.

    Main Results:

    • The acousto-optic sensor demonstrated a linear response with flip angle.
    • The sensor successfully detected the position of a tracking coil in a phantom during an imaging experiment.
    • Multiple coil signals could be detected, indicating potential for orientation detection.

    Conclusions:

    • Acousto-optic sensing is a viable method for tracking catheters in interventional MRI.
    • The developed sensor effectively reduces RF induced heating risks.
    • Further sensitivity improvements, such as using a narrow band FBG, are needed for real-time operation.