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An optically powered CMOS tracking system for 3 T magnetic resonance environment.

Baykal Sarioglu, Murat Tumer, Umut Cindemir

    IEEE Transactions on Biomedical Circuits and Systems
    |June 4, 2014
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces an optical catheter tracking system for 3 Tesla MRI, eliminating radiofrequency heating risks. The novel system uses light to power and control components, ensuring safe and accurate MRI-guided procedures.

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    Area of Science:

    • Biomedical Engineering
    • Medical Imaging Technology
    • Optical Systems

    Background:

    • Conventional wired catheter tracking systems for MRI face challenges with radiofrequency (RF) induced heating.
    • Accurate and safe catheter navigation within the MRI environment is crucial for interventional procedures.

    Purpose of the Study:

    • To present a fully optical Complementary Metal Oxide Semiconductor (CMOS) based catheter tracking system for 3 Tesla (3 T) Magnetic Resonance Imaging (MRI).
    • To address and mitigate the RF-induced heating issues associated with traditional wired systems in MRI environments.

    Main Methods:

    • Development of an integrated circuit comprising an optical power supply unit with a photodiode and DC-DC converter, and a direct conversion receiver.
    • Utilization of an optically driven switch controlled by light modulation for power transfer.
    • Integration of an on-chip local oscillator avoidance strategy using MRI-generated RF signals.
    • Optical data transfer for processed signals and frequency encoding for MRI tracking.

    Main Results:

    • The system successfully operates without noticeable temperature increases across various optical power levels.
    • Demonstrated full functionality and successful testing within a 3 T MRI machine.
    • The optical power supply unit effectively boosts low photodiode voltage to over 1.5 V.

    Conclusions:

    • The presented fully optical CMOS-based system offers a safe and effective solution for catheter tracking in 3 T MRI.
    • The novel optical switching and power delivery mechanism overcomes limitations of conventional wired systems.
    • This technology holds promise for enhancing the safety and precision of MRI-guided interventions.