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Related Experiment Video

Updated: Sep 20, 2025

An Experimental Protocol for Assessing the Performance of New Ultrasound Probes Based on CMUT Technology in Application to Brain Imaging
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Outperforming piezoelectric ultrasonics with high-reliability single-membrane CMUT array elements.

Eric B Dew1, Afshin Kashani Ilkhechi1, Mohammad Maadi1

  • 1Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Canada.

Microsystems & Nanoengineering
|June 7, 2022
PubMed
Summary
This summary is machine-generated.

Capacitive micromachined ultrasound transducers (CMUTs) now offer enhanced performance and reliability. New designs overcome challenges like dielectric charging and hysteresis, promising advanced ultrasonic applications.

Keywords:
Electrical and electronic engineeringElectronic devicesSensors

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Area of Science:

  • MEMS/NEMS
  • Ultrasound Transducer Technology
  • Materials Science

Background:

  • Capacitive micromachined ultrasound transducers (CMUTs) show potential to surpass piezoelectric transducers.
  • Existing CMUTs face challenges including dielectric charging, hysteresis, and suboptimal transmit sensitivity.
  • Current CMUT designs with multiple small membranes can lead to out-of-phase oscillations and performance degradation.

Purpose of the Study:

  • To introduce novel architectural features for high-reliability and enhanced-performance CMUTs.
  • To design CMUT array elements with a single long rectangular membrane to improve output pressure and electromechanical efficiency.
  • To evaluate and compare the performance of three CMUT architectures: contiguous dielectric, isolated isolation post (IIP), and insulated electrode-post (EP).

Main Methods:

  • Developed a wafer-bonding process with near-100% yield for CMUT fabrication.
  • Designed and fabricated three CMUT architectures: contiguous dielectric, IIP, and EP.
  • Tested CMUT performance, focusing on electromechanical efficiency, transmit efficiency, charging robustness, and hysteresis.

Main Results:

  • EP CMUTs achieved electromechanical efficiency as high as 0.95, exceeding previous CMUT and piezoelectric transducer values.
  • All tested CMUT architectures demonstrated 2-3 times greater transmit efficiency than reported CMUT or piezoelectric elements (1.5-2.0 MHz).
  • EP and IIP CMUTs exhibited significant charging robustness and minimal hysteresis over 500,000 actuation cycles.

Conclusions:

  • The proposed single-membrane CMUT architectures, particularly EP and IIP designs, significantly enhance performance and reliability.
  • These advancements address key limitations of traditional CMUTs, paving the way for improved ultrasonic applications.
  • The developed fabrication process and CMUT designs offer a promising path forward for next-generation ultrasound technology.