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Related Experiment Video

Updated: Dec 6, 2025

Wideband Optical Detector of Ultrasound for Medical Imaging Applications
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Ultrasonic Hydrogel Biochemical Sensor System.

Eunjeong Byun, Juhong Nam, Hyunji Shim

    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 novel hydrogel sensor for wireless biochemical detection using ultrasound. The system achieves a 0.2 pH resolution for wireless pH monitoring up to 10 cm.

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    Area of Science:

    • Biomedical Engineering
    • Materials Science
    • Acoustic Sensing

    Background:

    • Wireless biochemical sensors are crucial for real-time health monitoring.
    • Ultrasound-based sensing offers non-ionizing and deep-tissue penetration capabilities.
    • Hydrogels provide biocompatible platforms for sensor development.

    Purpose of the Study:

    • To develop a proof-of-concept hydrogel-based sensor system for wireless biochemical sensing.
    • To utilize backscattered ultrasound for robust measurements invariant to tissue acoustic properties.
    • To demonstrate wireless pH sensing with high resolution and practical sensing distance.

    Main Methods:

    • Fabrication of a silica-nanoparticle embedded hydrogel on a glass substrate.
    • Characterization of nanoparticle loading effects on hydrogel swelling and ultrasonic backscattering.
    • Implementation of dual-mode ultrasound interrogation (reflection ratio and time delay) for sensing.
    • Validation of the sensor's performance for pH measurement.

    Main Results:

    • The hydrogel sensor system exhibits output invariant to intervening biological tissue acoustic properties.
    • Silica nanoparticle loading was optimized to enhance ultrasonic backscattering.
    • Wireless pH sensing demonstrated a resolution of 0.2 pH units.
    • Successful wireless sensing achieved at a distance of approximately 10 cm.

    Conclusions:

    • The developed hydrogel sensor system offers a promising approach for wireless biochemical sensing.
    • The dual-interface backscattering design enhances robustness against tissue variations.
    • This technology has potential applications in minimally invasive diagnostics and continuous monitoring.