Design of a high frequency annular array for medical ultrasound

Kevin A. Snook, Timothy A. Ritter, Thomas R. Shrout, K. Kirk Shung

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations

Abstract

This paper reports the results of an effort of developing a 50 MHz annular array which incorporates a fine grain lead titanate as the piezoelectric material. The array achieves a better sensitivity than a comparable PVDF annular array and demonstrates low lateral coupling for reduced cross-talk. Using resonance techniques, the lead titanate has been fully characterized. The ceramic shows a clamped permittivity (ε33s0) equal to 180, a thickness coupling kt, of 0.49 and a planar coupling, kp, of 0.08. This material was fabricated into an annular array with an overall diameter of 5 mm and six equal-area elements. Separation of the elements was achieved using laser micromachining. Utilizing the waveforms from one-dimensional modeling, intensity field calculations predicted a maximum -6 dB lateral beamwidth of 160 μm over a six focal-zone region covering a 10 mm depth. Application of a triangular electrical apodization scheme across the elements resulted in a reduction in grating lobe amplitude below -26 dB.

Original languageEnglish (US)
Pages (from-to)1161-1164
Number of pages4
JournalProceedings of the IEEE Ultrasonics Symposium
Volume2
StatePublished - 2001
Event2001 Ultrasonics Symposium - Atlanta, GA, United States
Duration: Oct 6 2001Oct 10 2001

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

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