title: Design and fabrication of annular arrays for high-frequency ultrasound.
abstract: The design, fabrication, and performance of miniature high-frequency annular arrays are described. A 50-MHz, 2-mm-diameter, 7-element, equal-area annular array was fabricated and tested. The array elements were defined using photolithography and the electrical contacts were made using ultrasonic wire bonding. The resulting transducer produced pulses with a -6 dB bandwidth of 52% and an insertion loss of -16 dB. A radiation pattern was collected by scanning the transducer array above the tip of a glass fiber. A -6 dB two-way beam width of 75 microns was found at f/2. The radiation pattern decreased smoothly to less than -60 dB at a distance of 550 microns.
authors.affiliation: Department of Physics, Queen's University, Kingston, ON, Canada. 7jab4@qlink.queensu.ca
authors.forename: Jeremy A
authors.initials: JA
authors.lastname: Brown
authors.forename: Christine E M
authors.initials: CE
authors.lastname: Démoré
authors.forename: Geoffrey R
authors.initials: GR
authors.lastname: Lockwood
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design / Q000379:methods*; D019544:Equipment Failure Analysis; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014159:Transducers; D014463:Ultrasonography / Q000295:instrumentation* / Q000379:methods*