Medical imaging arrays for frequencies above 25 MHz

• Published in: 1999 IEEE Ultrasonics Symposium. Proceedings. International Symposium (Cat. No.99CH37027) Vol. 2; pp. 1203 - 1207 vol.2
• Main Authors: Ritter, T.A., Shung, K.K., Tutwiler, R.L., Shrout, T.R.
• Format: Conference Proceeding
• Language: English
• Published: IEEE 1999
• Subjects: Bioceramics; Biomedical imaging; Circuit testing; Coaxial cables; Fabrication; Focusing; Frequency; Lenses; Optical design; Polymers
• ISBN: 0780357221; 9780780357228
• ISSN: 1051-0117
• DOI: 10.1109/ULTSYM.1999.849213

A fabrication method has been developed for composite linear arrays operating at a frequency of 30 MHz. The design features dual matching layers, a lens for focusing in the elevation direction, a 2-2 composite with 28 /spl mu/m wide ceramics and 5.3 /spl mu/m polymer widths, and coaxial cable for electrical impedance matching. Bandwidths exceeding 65% and crosstalk values less than -30 dB were measured on prototype arrays. A non-composite 35 MHz design has also been investigated. An interconnect method using a flex circuit and sputtered metal has been tested. Properties were then measured by fitting experimental impedance data to a model using a non-linear regression technique. A k/sub 33/' of 0.63 and an /spl epsiv//sub 33//sup S///spl epsiv//sub 0/ of 1310 were measured for array elements operating at 35 MHz.