標題: A capacitive micromachined ultrasonic transducer array for minimally invasive medical diagnosis
作者: Chen, Jingkuang
Cheng, Xiaoyang
Chen, Chien-Chang
Li, Pai-Chi
Liu, Jian-Hung
Cheng, Yu-Ting
電子工程學系及電子研究所
Department of Electronics Engineering and Institute of Electronics
關鍵字: acoustic devices;acoustic transducers;actuators
公開日期: 1-Jun-2008
摘要: A capacitive micromachined ultrasonic transducer (CMUT) array for minimally invasive medical diagnosis has been developed. Unlike traditional ultrasonic transducers, which generally use a bulky piece of substrate, this transducer array was integrated on a 40-mu m-thick micromachined silicon substrate into a probe shape with a typical shank width of 50-80 mu m and a shank length of 4-8 mm. For 1-D arrays, 24-96 CMUT devices were integrated on one such silicon probe and formed an accurately configured phase array. In addition to miniaturization, reduction of the substrate thickness also decreases the intertransducer crosstalk due to substrate Lamb waves. Due to its miniature size, this array can be placed or implanted close to the target tissue/organ and can perform high-resolution high-precision diagnosis and stimulation using high-frequency ultrasounds. The issue of conflict between resolution and penetration depth of ultrasonic diagnosis can therefore be resolved. A two-layer polysilicon surface micromachining process was used to fabricate this device. Suspended polysilicon membranes of diameters ranging from 20 to 90 mu ms and thicknesses from 1.0 to 2.5 mu m were used to generate and detect ultrasounds of frequencies ranging from I to 10 MHz. B-mode imaging using this transducer array has been demonstrated.
URI: http://dx.doi.org/10.1109/JMEMS.2009.922076
http://hdl.handle.net/11536/8782
ISSN: 1057-7157
DOI: 10.1109/JMEMS.2009.922076
期刊: JOURNAL OF MICROELECTROMECHANICAL SYSTEMS
Volume: 17
Issue: 3
起始頁: 599
結束頁: 610
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