Journal ArticleDOI
Forward-viewing CMUT arrays for medical imaging
TLDR
The designed, forward-viewing annular CMUT array is suitable for mounting on the front surface of a cylindrical catheter probe and can provide Doppler information for measurement of blood flow and guiding information for navigation through blood vessels in intravascular ultrasound imaging.Abstract:
This paper reports the design and testing of forward-viewing annular arrays fabricated using capacitive micromachined ultrasonic transducer (CMUT) technology. Recent research studies have shown that CMUTs have broad frequency bandwidth and high-transduction efficiency. One- and two-dimensional CMUT arrays of various sizes already have been fabricated, and their viability for medical imaging applications has been demonstrated. We fabricated 64-element, forward-viewing annular arrays using the standard CMUT fabrication process and carried out experiments to measure the operating frequency, bandwidth, and transmit/receive efficiency of the array elements. The annular array elements, designed for imaging applications in the 20 MHz range, had a resonance frequency of 13.5 MHz in air. The immersion pulse-echo data collected from a plane reflector showed that the devices operate in the 5-26 MHz range with a fractional bandwidth of 135%. The output pressure at the surface of the transducer was measured to be 24 kPa/V. These values translate into a dynamic range of 131.5 dB for 1-V excitation in 1-Hz bandwidth with a commercial low noise receiving circuitry. The designed, forward-viewing annular CMUT array is suitable for mounting on the front surface of a cylindrical catheter probe and can provide Doppler information for measurement of blood flow and guiding information for navigation through blood vessels in intravascular ultrasound imaging.read more
Citations
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Journal ArticleDOI
Molecular ultrasound imaging using microbubble contrast agents.
Paul A. Dayton,Joshua J. Rychak +1 more
TL;DR: This review summarizes current applications and challenges of molecular ultrasound imaging and offers future technologies which likely follow as an improvement to the existing techniques.
Journal ArticleDOI
Annular-ring CMUT arrays for forward-looking IVUS: transducer characterization and imaging
TL;DR: It is demonstrated that annular-ring CMUT arrays fabricated with CMOS-compatible processes are capable of forward-looking IVUS imaging, and the developed modeling tools can be used to design improved IVUS Imaging arrays.
Journal ArticleDOI
Single-chip CMUT-on-CMOS front-end system for real-time volumetric IVUS and ICE imaging
Gokce Gurun,Coskun Tekes,Jaime Zahorian,Toby Xu,Sarp Satir,Mustafa Karaman,Jennifer Hasler,F. Levent Degertekin +7 more
TL;DR: In this article, a 1.4-mm-diameter dual-ring transducer array using CMUT-on-CMOS technology on a front-end IC implemented in 0.35-μm CMOS process is presented.
Journal ArticleDOI
3-D ultrasound imaging using a forward-looking CMUT ring array for intravascular/intracardiac applications
TL;DR: This work presents compelling, full-synthetic, phased-array volumetric images from a forward-viewing capacitive micromachined ultrasonic transducer (CMUT) ring array wire bonded to a custom integrated circuit front end.
Journal ArticleDOI
Front-end receiver electronics for high-frequency monolithic CMUT-on-CMOS imaging arrays
TL;DR: This paper describes the design of CMOS receiver electronics for monolithic integration with capacitive micromachined ultrasonic transducer (CMUT) arrays for high-frequency intravascular ultrasound imaging and shows successful system operation with a pulseecho measurement.
References
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Journal ArticleDOI
Surface micromachined capacitive ultrasonic transducers
TL;DR: A theoretical model is proposed that agrees well with observed transducer behavior and is used to demonstrate that microfabricated ultrasonic transducers constitute an attractive alternative to piezoelectric transducers in many applications.
Journal ArticleDOI
Synthetic aperture imaging for small scale systems
TL;DR: Multi-element synthetic aperture imaging methods suitable for applications with severe cost and size limitations are explored in this article, where each method uses different spatial frequencies and acquisition strategies for imaging, and therefore different sets of active transmit/receive element combinations.
Journal ArticleDOI
Capacitive micromachined ultrasonic transducers: next-generation arrays for acoustic imaging?
Omer Oralkan,Arif Sanli Ergun,J.A. Johnson,Mustafa Karaman,Utkan Demirci,K. Kaviani,Thomas H. Lee,Butrus T. Khuri-Yakub +7 more
TL;DR: The first pulse-echo phased array B-scan sector images using a 128-element, one-dimensional (1-D) linear CMUT array is presented and preliminary investigations on the effects of crosstalk among array elements on the image quality are performed.
Journal ArticleDOI
A surface micromachined electrostatic ultrasonic air transducer
TL;DR: In this article, an electrical equivalent circuit model for electrostatic transducers based on the early work of Mason (1942) was designed and constructed for operation at 1.8 and 4.6 MHz.