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Related Experiment Video

Updated: May 9, 2026

An Experimental Protocol for Assessing the Performance of New Ultrasound Probes Based on CMUT Technology in Application to Brain Imaging
16:01

An Experimental Protocol for Assessing the Performance of New Ultrasound Probes Based on CMUT Technology in Application to Brain Imaging

Published on: September 24, 2017

Volumetric Flow Measurement Using an Implantable CMUT Array.

Mengli Wang, Jingkuang Chen

    IEEE Transactions on Biomedical Circuits and Systems
    |July 16, 2013
    PubMed
    Summary

    This study presents an implantable capacitive micromachined ultrasonic transducer (CMUT) array for accurate volumetric flow velocity measurement. The novel device achieves high precision, with less than 5% discrepancy compared to laser Doppler flowmetry.

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    Area of Science:

    • Biomedical Engineering
    • Ultrasound Technology
    • Microelectromechanical Systems (MEMS)

    Background:

    • Accurate volumetric flow velocity measurement is crucial for diagnosing and monitoring various medical conditions.
    • Existing methods may be invasive or lack the necessary precision for certain applications.
    • Capacitive micromachined ultrasonic transducers (CMUTs) offer potential for miniaturized and implantable flow measurement devices.

    Purpose of the Study:

    • To describe the development and validation of an implantable CMUT array for volumetric flow velocity measurement.
    • To optimize the performance of transmission and reception CMUTs using MEMS fabrication.
    • To evaluate the accuracy of the CMUT flowmeter against a gold standard.

    Main Methods:

    • Utilized a multi-concentric CMUT ring array for ultrasound transmission and an annular CMUT array for reception.

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    Quantitatively Measuring In situ Flows using a Self-Contained Underwater Velocimetry Apparatus (SCUVA)
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    Quantitatively Measuring In situ Flows using a Self-Contained Underwater Velocimetry Apparatus (SCUVA)

    Published on: October 31, 2011

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    Last Updated: May 9, 2026

    An Experimental Protocol for Assessing the Performance of New Ultrasound Probes Based on CMUT Technology in Application to Brain Imaging
    16:01

    An Experimental Protocol for Assessing the Performance of New Ultrasound Probes Based on CMUT Technology in Application to Brain Imaging

    Published on: September 24, 2017

    Quantitatively Measuring In situ Flows using a Self-Contained Underwater Velocimetry Apparatus (SCUVA)
    09:22

    Quantitatively Measuring In situ Flows using a Self-Contained Underwater Velocimetry Apparatus (SCUVA)

    Published on: October 31, 2011

  • Employed Microelectromechanical-system (MEMS) fabrication to tailor membrane thickness and gap height for distinct CMUT functions.
  • Implemented pulse ultrasound Doppler, time-domain signal sampling, time-of-flight delay difference for vessel diameter, and cross-correlation for flow angle determination.
  • Tested the device with artificial blood in polymer tubes at a constant volumetric flow rate.

    • Main Results:

    • Achieved a discrepancy of less than 5% when comparing the CMUT flowmeter to a calibrated laser Doppler flowmeter.
    • Demonstrated the feasibility of using an 80-100 μm thick, 2-mm-diameter CMUT array for minimally disruptive implantation.
    • Successfully measured blood-flow velocity, vessel diameter, and flow angle using the developed ultrasound techniques.

    Conclusions:

    • The developed implantable CMUT array provides accurate and precise volumetric flow velocity measurements.
    • MEMS fabrication enables optimized performance of integrated transmission and reception CMUTs.
    • This technology holds promise for advanced, minimally invasive hemodynamic monitoring.