| Literature DB >> 21342833 |
Dan Zhou1, Kwok Fung Cheung, Yan Chen, Sien Ting Lau, Qifa Zhou, K Kirk Shung, Hao Su Luo, Jiyan Dai, Helen Lai Wa Chan.
Abstract
In this paper, 0.7Pb(Mg(¹/₃)Nb(²/₃)O₃-0.3PbTiO₃ (PMN-PT) single crystal/epoxy 1/3 composite was used as the active material of the endoscopic ultrasonic radial array transducer, because this composite exhibited ultrahigh electromechanical coupling coefficient (k(t) = 0.81%), very low mechanical quality factor (Q(m) = 11) and relatively low acoustic impedance (Z(t) = 12 MRayls). A 6.91 MHz PMN-PT/epoxy 1/3 composite radial array transducer with 64 elements was tested in a pulseecho response measurement. The -6-dB bandwidth of the composite array transducer was 102%, which was ~30% larger than that of traditional lead zirconate titanate array transducer. The two-way insertion loss was found to be -32.3 dB. The obtained results show that this broadband array transducer is promising for acquiring high-resolution endoscopic ultrasonic images in many clinical applications.Entities:
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Year: 2011 PMID： 21342833 PMCID： PMC3056406 DOI： 10.1109/TUFFC.2011.1825
Source DB: PubMed Journal: IEEE Trans Ultrason Ferroelectr Freq Control ISSN： 0885-3010 Impact factor: 2.725