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Wireless Power Harvesting During MRI.

Madhav Venkateswaran, Krishna Kurpad, James E Brown

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |October 6, 2020
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a method for wireless power harvesting directly from MRI radiofrequency (RF) fields. This technology enables powering medical devices during MRI scans, improving functionality with minimal cost.

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    Area of Science:

    • Biomedical Engineering
    • Electrical Engineering
    • Medical Imaging Physics

    Background:

    • Magnetic Resonance Imaging (MRI) systems utilize strong radiofrequency (RF) fields.
    • Powering in-bore medical accessories during MRI scans presents a significant challenge.
    • Existing solutions for powering devices within the MRI bore are often complex or costly.

    Purpose of the Study:

    • To develop and validate a method for harvesting wireless power directly from the MRI RF field.
    • To enable concurrent operation of in-bore wireless power harvesting and MRI scanning.
    • To assess the impact of wireless power harvesting on MRI image quality.

    Main Methods:

    • Modeling of energy harvesting by a harvester coil as a function of the MRI B1 RF field.
    • Simulation of RF-DC conversion using power-dependent large-signal S-parameters.
    • Application of a reference impedance-based modeling approach to cascade linear inductive coupling and nonlinear diode rectification models.
    • Validation of the proposed modeling approach.
    • Implementation and testing on a clinical MRI system.

    Main Results:

    • Successful modeling and validation of the wireless power harvesting system.
    • Demonstration of concurrent in-bore wireless power harvesting and MRI scanning.
    • Investigation into the effects of artifacts on MRI image quality, indicating feasibility.
    • Independent optimization of harvester coils and RF-DC converters is enabled, maximizing harvesting efficiency.

    Conclusions:

    • Wireless power harvesting directly from MRI RF fields is feasible.
    • This technique offers a low-cost, minimally invasive solution for powering in-bore medical accessories.
    • The developed methods allow for independent optimization of system components for enhanced efficiency.