Proceedings ArticleDOI
2F-2 Annular CMUT Arrays for Side Looking Intravascular Ultrasound Imaging
Stephane Carlier,A. Sisman,M. Karaman +2 more
- pp 84-87
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TLDR
In this paper, an 840 mum diameter, 8 element CMUT annular array is presented for high resolution side-looking intravascular ultrasound (SL-IVUS) imaging.Abstract:
Although side looking intravascular ultrasound (SL-IVUS) imaging systems using single element piezoelectric transducers set the resolution standard in the assessment of the extent of coronary artery disease, improvements in transducer performance are needed to perform harmonic imaging and high resolution imaging of vulnerable plaque. With their small channel count, annular arrays exploiting the inherent broad bandwidth of CMUTs and electronic focusing capability of integrated electronics provide a path for desired SL-IVUS imaging catheters. In this paper, we first describe the design, low temperature fabrication of an 840 mum diameter, 8 element CMUT annular array. Testing of the individual elements in oil shows a uniform device behavior with 100% fractional bandwidth around 20 MHz without including the effects of attenuation and diffraction. We also present linear scan imaging results obtained on wire targets in oil, tissue and tissue mimicking phantoms using both unfocused and dynamically focused transducers. The results for axial and lateral resolution are in agreement predicted by the simulations and show the feasibility of this approach for high resolution SL-IVUS imaging.read more
Citations
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Journal ArticleDOI
An Analog Integrated Circuit Beamformer for High-Frequency Medical Ultrasound Imaging
Gokce Gurun,Jaime Zahorian,Alper Sisman,Mustafa Karaman,Paul Hasler,Fahrettin Levent Degertekin +5 more
TL;DR: Experimental test results demonstrated the desired buffering, preamplification and delaying capabilities of the beamformer.
Proceedings ArticleDOI
Single chip CMUT arrays with integrated CMOS electronics: Fabrication process development and experimental results
Jaime Zahorian,Rasim Guldiken,Gokce Gurun,M.S. Qureshi,M. Balantekin,Paul Hasler,Fahrettin Levent Degertekin +6 more
TL;DR: In this paper, the authors describe successful fabrication of CMUTs on custom designed CMOS electronics from a commercial IC foundry, which is achieved by modifying a low temperature micromachining process by adding one additional mask and developing a sloped wall dry etching step on isolation oxide layer for metal interconnect.
Proceedings ArticleDOI
A tunable analog delay element for high-frequency dynamic beamforming
Gokce Gurun,Alper Sisman,Jaime Zahorian,Sarp Satir,Mustafa Karaman,Paul Hasler,Levent Degertekin +6 more
TL;DR: An improved voltage in voltage out low pass filter is introduced as an analog delay cell for high frequency dynamic beamformers and results of preliminary imaging experiments that demonstrate the focusing capability are presented.
Proceedings ArticleDOI
Evaluation of CMUT annular arrays for side-looking IVUS
Alper Sisman,Jaime Zahorian,Gokce Gurun,Mustafa Karaman,M. Balantekin,F. Levent Degertekin,Paul Hasler +6 more
TL;DR: In this paper, the authors explore a new SL-IVUS probe architecture employing rotating phased annular CMUT arrays and compare the imaging performance of the existing and proposed probe configurations through simulated point spread functions.
References
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Journal ArticleDOI
Design and fabrication of a 40-MHz annular array transducer
TL;DR: This paper investigates the feasibility of fabricating a five-ring, focused annular array transducer operating at 40 MHz using a 9-/spl mu/m thick polyvinylidene fluoride film.
Journal ArticleDOI
Low temperature fabrication of immersion capacitive micromachined ultrasonic transducers on silicon and dielectric substrates
TL;DR: In this paper, the authors describe the fabrication process of capacitive micromachined ultrasonic transducers (CMUTs) on silicon and quartz substrates for immersion applications.
Journal ArticleDOI
Synthetic phased arrays for intraluminal imaging of coronary arteries
Matthew O'Donnell,Michael J. Eberle,Douglas N. Stephens,J.L. Litzza,K. San Vicente,B.M. Shapo +5 more
TL;DR: In this article, a 64-element, high efficiency, ceramic piezoelectric array transducer operating at 20 MHz has been constructed for ultrasonic intraluminal imaging.
Journal ArticleDOI
Design and fabrication of annular arrays for high-frequency ultrasound
TL;DR: The design, fabrication, and performance of miniature high-frequency annular arrays are described and a 50-MHz, 2-mm-diameter, 7-element, equal-area annular array was fabricated and tested.
Proceedings ArticleDOI
High-frequency CMUT arrays for high-resolution medical imaging
TL;DR: In this paper, the authors describe high-frequency 1D CMUT arrays designed and fabricated for use in electronically scanned high-resolution ultrasonic imaging systems, where a single element in each array is connected to a single-channel front-end integrated circuit for pulse-echo operation.
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