title: Design and fabrication of PZN-7%PT single crystal high frequency angled needle ultrasound transducers.
abstract: A high-frequency angled needle ultrasound transducer with an aperture size of 0.4 x 0.56 mm2 was fabricated using a lead zinc niobate-lead titanate (PZN- 7%PT) single crystal as the active piezoelectric material. The single crystal was bonded to a conductive silver particle matching layer and a conductive epoxy backing material through direct contact curing. A parylene outer matching layer was formed by vapor deposition. Angled needle probe configuration was achieved by dicing at 45 degrees to the single crystal poling direction to satisfy a clinical request for blood flow measurement in the posterior portion of the eye. The electrical impedance magnitude and phase of the transducer were 42 Omega and -63 degrees , respectively. The measured center frequency and the fractional bandwidth at -6 dB were 43 MHz and 45%, respectively. The two-way insertion loss was approximately 17 dB. Wire phantom imaging using fabricated PZN-7%PT single crystal transducers was obtained and spatial resolutions were assessed.
authors.forename: Qifa
authors.initials: Q
authors.lastname: Zhou
authors.forename: Dawei
authors.initials: D
authors.lastname: Wu
authors.forename: Jing
authors.initials: J
authors.lastname: Jin
authors.forename: Chang-hong
authors.initials: CH
authors.lastname: Hu
authors.forename: Xiaochen
authors.initials: X
authors.lastname: Xu
authors.forename: Jay
authors.initials: J
authors.lastname: Williams
authors.forename: Jonathan M
authors.initials: JM
authors.lastname: Cannata
authors.forename: Leongchew
authors.initials: L
authors.lastname: Lim
authors.forename: K Kirk
authors.initials: KK
authors.lastname: Shung
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007854:Lead / Q000737:chemistry* / Q000528:radiation effects*; D009339:Needles; D009556:Niobium / Q000737:chemistry* / Q000528:radiation effects*; D014025:Titanium / Q000737:chemistry* / Q000528:radiation effects*; D014159:Transducers; D014463:Ultrasonography / Q000379:methods*; D015032:Zinc / Q000737:chemistry* / Q000528:radiation effects*
chemical_list: C474493:lead zinc niobate titanate; D009556:Niobium; D007854:Lead; D014025:Titanium; D015032:Zinc