An endoscopie imaging system based on a two-dimensional CMUT array: real-time imaging results

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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-?m 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.


Anahtar Kelimeler

Capacitive micromachined ultrasonic transducer;, Catheter, CMUT, Integrated electronics, Real-time, Ultrasound imaging, Volumetric, Bandwidth, Diagnosis, Imaging systems, Piezoelectric transducers, Real time systems, Ultrasonic transducers, Integrated electronics, Endoscopy, Real time systems, Ultrasonic imaging, Ultrasonic transducer arrays, Pulse amplifiers, Bonding, Frequency, Data acquisition, Geometry


IEEE Ultrasonics Symposium

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Wygant, 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