An endoscopie imaging system based on a two-dimensional CMUT array: real-time imaging results
AuthorWygant, Ira O.
Yeh, David T.
Ergün, Arif Sanlı
Khuri-Yakub, Butrus Thomas
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CitationWygant, Ira O., Zhuang, X., Yeh, D. T., Vaithilingam, S., Nikoozadeh, A., Oralkan, Ö., Ergün, A. S., Karaman, M. & Khuri-Yakub, B. T. (2005). An endoscopie imaging system based on a two-dimensional CMUT array: real-time imaging results. Paper presented at the IEEE Ultrasonics Symposium, 2, 792 - 795. doi:10.1109/ULTSYM.2005.1602970
Real-time catheter-based ultrasound imaging tools are needed for diagnosis and image-guided procedures. The continued development of these tools is partially limited by the difficulty of fabricating two-dimensional array geometries of piezoelectric transducers. Using capacitive micromachined ultrasonic transducer (CMUT) technology, transducer arrays with widely varying geometries, high frequencies, and wide bandwidths can be fabricated. A volumetric ultrasound imaging system based on a two-dimensional, 16×l6-element, CMUT array is presented. Transducer arrays with operating frequencies ranging from 3 MHz to 7.5 MHz were fabricated for this system. The transducer array including DC bias pads measures 4 mm by 4.7 mm. The transducer elements are connected to flip-chip bond pads on the array back side with 400-μm long through-wafer interconnects. The array is flip-chip bonded to a custom-designed integrated circuit (IC) that comprises the front-end electronics. Integrating the front-end electronics with the transducer array reduces the effects of cable capacitance on the transducer's performance and provides a compact means of connecting to the transducer elements. The front-end IC provides a 27-V pulser and 10-MHz bandwidth amplifier for each element of the array. An FPGA-based data acquisition system is used for control and data acquisition. Output pressure of 230 kPa was measured for the integrated device. A receive sensitivity of 125 mV/kPa was measured at the output of the amplifier. Amplifier output noise at 5 Mhz is 112 nV/√Hz. Volumetric images of a wire phantom and vessel phantom are presented. Volumetric data for a wire phantom was acquired in real-time at 30 frames per second.
SourceIEEE Ultrasonics Symposium
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