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Related Concept Videos

Ultrasonography01:17

Ultrasonography

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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
During an ultrasonography procedure, a handheld device called...
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Optimizing Volumetric Efficiency and Backscatter Communication in Biosensing Ultrasonic Implants.

Mohammad Meraj Ghanbari, Rikky Muller

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    This study presents a systematic design approach for miniaturized ultrasonic biosensing implants. We developed an equivalent circuit model and closed-form expressions to optimize piezo geometry for efficient backscatter communication.

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    Area of Science:

    • Biomedical Engineering
    • Acoustics
    • Materials Science

    Background:

    • Deep-tissue biosensing implants utilize piezoceramic (piezo) resonators as acoustic antennas for ultrasonic backscatter communication.
    • Miniaturization of these implants is crucial for reducing tissue displacement and enabling minimally invasive procedures.

    Purpose of the Study:

    • To provide a systematic design approach for implant piezo geometry and operating frequency to minimize implant volume.
    • To optimize ultrasonic backscatter communication link performance by addressing the piezo acoustic reflection coefficient (Γ) dependency on shunt impedance (ZE).

    Main Methods:

    • Developed a SPICE-friendly equivalent circuit model for piezo-IC co-simulation, incorporating path losses.
    • Derived experimentally validated closed-form expressions for Γ(ZE) under various boundary conditions.
    • Contrasted optimal piezo geometry for backscatter communication with that for power harvesting.

    Main Results:

    • Presented a systematic method to minimize implant volume by optimizing piezo geometry and frequency.
    • Introduced a novel equivalent circuit model for accurate channel characterization.
    • Provided closed-form expressions for Γ(ZE) that facilitate systematic modulator design.

    Conclusions:

    • The developed models and expressions enable systematic design and synthesis of ultrasonic backscatter uplink modulators.
    • This approach leads to improved data rates and linearity in miniaturized biosensing implants.
    • Optimized piezo geometry and frequency are key for efficient backscatter communication in implantable devices.