Development of a 35-MHz piezo-composite ultrasound array for medical imaging.
This paper discusses the development of a 64-element 35-MHz composite ultrasonic array. This array was designed primarily for ocular imaging applications, and features 2-2 composite elements mechanically diced out of a fine-grain high-density Navy Type VI ceramic. Array elements were spaced at a 50-micron pitch, interconnected via a custom flexible circuit and matched to the 50-ohm system electronics via a 75-ohm transmission line coaxial cable. Elevation focusing was achieved using a cylindrically shaped epoxy lens. One functional 64-element array was fabricated and tested. Bandwidths averaging 55%, 23-dB insertion loss, and crosstalk less than -24 dB were measured. An image of a tungsten wire target phantom was acquired using a synthetic aperture reconstruction algorithm. The results from this imaging test demonstrate resolution exceeding 50 microm axially and 100 microm laterally.
NIH Resource on Medical Ultrasonic Transducer Technology, Department of Biomedical Engineering, University of Southern California, Los Angeles, CA, USA. cannata@usc.edu
Jonathan M
JM
Cannata
Jay A
JA
Williams
Qifa
Q
Zhou
Timothy A
TA
Ritter
K Kirk
KK
Shung
D002516:Ceramics; D003198:Computer Simulation; D017076:Computer-Aided Design; D004563:Electrochemistry / Q000295:instrumentation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D007089:Image Enhancement / Q000295:instrumentation*; D008839:Microelectrodes; D008904:Miniaturization / Q000379:methods; D008962:Models, Theoretical; D014159:Transducers; D014463:Ultrasonography / Q000295:instrumentation*