High-density flexible interconnect for two-dimensional ultrasound arrays |
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Authors: | Fiering J O Hultman P Lee W Light E D Smith S W |
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Affiliation: | Dept. of Electr. and Comput. Eng., North Carolina State Univ., Raleigh, NC. |
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Abstract: | We present a method for fabricating flexible multilayer circuits for interconnection to 2-D array ultrasound transducers. In addition, we describe four 2-D arrays in which such flexible interconnect is implemented, including transthoracic arrays with 438 channels operating at up to 7 MHz and intracardiac catheter arrays with 70 channels operating at up to 7 MHz. We employ thin and thick film microfabrication techniques to batch produce the interconnect circuits with minimum dimensions of 12-mum lines, 40-mum vias, and 150-mum array pitch. The arrays show 50-Omega insertion loss of -60 to -84 dB and a fractional bandwidth of 27 to 67%. The arrays are used to obtain real time, in vivo volumetric scans. |
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