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An MRI-readable wireless flexible pressure sensor.

Tatsuya Nakamura, Yusuke Inoue, Dongmin Kim

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |January 7, 2016
    PubMed
    Summary
    This summary is machine-generated.

    Researchers created a wireless, flexible pressure sensor detectable by magnetic resonance imaging (MRI). This novel device enables non-invasive wireless pressure monitoring within the body, crucial for medical diagnostics and observation.

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    Area of Science:

    • Biomedical Engineering
    • Medical Imaging
    • Materials Science

    Background:

    • Accurate in-vivo pressure measurement is vital for diagnosing conditions and post-operative patient monitoring.
    • Traditional wired pressure sensors pose challenges with connectivity and infection risk, especially for internal applications.
    • Wireless sensing solutions are needed to overcome the limitations of existing wired technologies.

    Purpose of the Study:

    • To develop a novel magnetic resonance imaging (MRI)-detectable wireless flexible pressure sensor.
    • To enable non-invasive, real-time pressure monitoring within biological systems.
    • To overcome the limitations of conventional wired pressure sensors in clinical settings.

    Main Methods:

    • Fabrication of a flexible pressure sensor utilizing a pressure-sensitive LC resonator on a film substrate.
    • Design of an LC resonator to resonate at 300 MHz (7-T MRI Larmor frequency) for wireless MRI detection.
    • Characterization of frequency-impedance changes under varying pressures and in-vivo MRI imaging of the sensor in an agarose gel model.

    Main Results:

    • The fabricated flexible sensor demonstrated a ~10% decrease in resonance frequency under pressure.
    • MRI contrast changes were observed around the sensor when subjected to physiological pressures (~20 kPa).
    • The sensor showed sufficient sensitivity for wireless measurement of blood pressure equivalents.

    Conclusions:

    • A wireless, MRI-detectable flexible pressure sensor was successfully developed.
    • The sensor can detect physiological pressures wirelessly, offering a promising alternative to wired sensors.
    • Future work will focus on quantitative pressure sensing using MRI contrast changes and flip angle mapping.