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12 April 2000 Phased array probe using Pb(Zn1/3Nb2/3)O3-PbTiO3 single-crystal-polymer composites
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A 96-channel phased array probe using Pb(Zn1/3Nb2/3)O3-PbTiO3 (PZNT 91/9) single-crystal-polymer composites has been successfully fabricated to realize broader bandwidth property. Wafers of PZNT 91/9 single crystals larger than 15 X 20 mm were prepared by a Bridgman method. 1 - 3 composites were fabricated using an improved dice-fill technique. Fabricated 1 - 3 composites with 67% volume fraction of single crystal showed electromechanical coupling factors (k33') of over 80% acoustic impedances of 10 to 12 Mrayls, and dielectric constants of 1,800 to 2,100. A phased array probe with a center frequency of 3.5 MHz was fabricated using the 1 - 3 composites. A flexible printed circuit was connected to the composite and all elements were successfully cut using an improved fabrication process. The bandwidth of the PZNT 91/9 single-crystal composite probes is twice as broad as that of conventional PZT ceramic probe. Echo amplitudes of these PZNT 91/9 single-crystal composite probes are almost the same as those of conventional PZT ceramic probes.
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Kazuhiro Itsumi, Shiroh Saitoh, Mamoru Izumi, Tsuyoshi Kobayashi, Kouichi Harada, and Yohachi Yamashita "Phased array probe using Pb(Zn1/3Nb2/3)O3-PbTiO3 single-crystal-polymer composites", Proc. SPIE 3982, Medical Imaging 2000: Ultrasonic Imaging and Signal Processing, (12 April 2000);

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