title: Fabrication and performance of endoscopic ultrasound radial arrays based on PMN-PT single crystal/epoxy 1-3 composite.
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.
authors.affiliation: Department of Applied Physics and Materials Research Centre, The Hong Kong Polytechnic University, Hong Kong, China.
authors.forename: Dan
authors.initials: D
authors.lastname: Zhou
authors.forename: Kwok Fung
authors.initials: KF
authors.lastname: Cheung
authors.forename: Yan
authors.initials: Y
authors.lastname: Chen
authors.forename: Sien Ting
authors.initials: ST
authors.lastname: Lau
authors.forename: Qifa
authors.initials: Q
authors.lastname: Zhou
authors.forename: K Kirk
authors.initials: KK
authors.lastname: Shung
authors.forename: Hao Su
authors.initials: HS
authors.lastname: Luo
authors.forename: Jiyan
authors.initials: J
authors.lastname: Dai
authors.forename: Helen Lai Wa
authors.initials: HL
authors.lastname: Chan
mesh_terms: D017097:Electric Impedance; D019160:Endosonography / Q000295:instrumentation*; D004852:Epoxy Compounds / Q000737:chemistry*; D004867:Equipment Design; D007854:Lead / Q000737:chemistry; D009556:Niobium / Q000737:chemistry; D010087:Oxides / Q000737:chemistry; D014025:Titanium / Q000737:chemistry; D014159:Transducers
chemical_list: D004852:Epoxy Compounds; D010087:Oxides; D009556:Niobium; D007854:Lead; D014025:Titanium