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Forward-viewing CMUT arrays for medical imaging
Utkan Demirci1, Arif S Ergun, Omrer Oralkan
1E. L. Ginzton Laboratory, Stanford University, Stanford, CA 94305-4088, USA. utkan@stanford.edu
Summary
This study presents forward-viewing annular arrays using capacitive micromachined ultrasonic transducer (CMUT) technology. These arrays offer broad bandwidth and high efficiency, suitable for intravascular ultrasound imaging applications.
Area of Science:
- Biomedical Engineering
- Ultrasound Technology
- Transducer Design
Background:
- Capacitive micromachined ultrasonic transducers (CMUTs) are recognized for their broad frequency bandwidth and high transduction efficiency.
- Previous research has established the viability of CMUT arrays for medical imaging applications.
- CMUT technology offers potential for advanced ultrasound imaging systems.
Purpose of the Study:
- To design and test forward-viewing annular arrays utilizing CMUT technology.
- To evaluate the performance characteristics of these arrays for medical imaging.
- To assess their suitability for intravascular ultrasound (IVUS) applications.
Main Methods:
- Fabrication of 64-element, forward-viewing annular arrays using a standard CMUT process.
- Experimental measurement of operating frequency, bandwidth, and transmit/receive efficiency.
- Collection of immersion pulse-echo data using a plane reflector.
Main Results:
- Annular array elements designed for 20 MHz imaging resonated at 13.5 MHz in air.
- Devices operated within the 5-26 MHz range with a 135% fractional bandwidth.
- Measured output pressure was 24 kPa/V, yielding a dynamic range of 131.5 dB.
Conclusions:
- The developed forward-viewing annular CMUT array is well-suited for catheter-based intravascular ultrasound imaging.
- The array's performance characteristics support Doppler blood flow measurement and navigational guidance.
- CMUT technology demonstrates significant potential for advancing IVUS probe capabilities.