A 30-MHz piezo-composite ultrasound array for medical imaging applications

Timothy A. Ritter, Thomas R. Shrout, Rick Tutwiler, K. Kirk Shung

Research output: Contribution to journalArticle

200 Scopus citations

Abstract

Ultrasound imaging at frequencies above 20 MHz is capable of achieving improved resolution in clinical applications requiring limited penetration depth. High frequency arrays that allow real-time imaging are desired for these applications but are not yet currently available. In this work, a method for fabricating fine-scale 2-2 composites suitable for 30-MHz linear array transducers was successfully demonstrated. High thickness coupling, low mechanical loss, and moderate electrical loss were achieved. This piezo-composite was incorporated into a 30-MHz array that included acoustic matching, an elevation focusing lens, electrical matching, and an air-filled kerf between elements. Bandwidths near 60%, 15-dB insertion loss, and crosstalk less than -30 dB were measured. Images of both a phantom and an ex vivo human eye were acquired using a synthetic aperture reconstruction method, resulting in measured lateral and axial resolutions of approximately 100 μm.

Original languageEnglish (US)
Pages (from-to)217-230
Number of pages14
JournalIEEE transactions on ultrasonics, ferroelectrics, and frequency control
Volume49
Issue number2
DOIs
StatePublished - Feb 1 2002

All Science Journal Classification (ASJC) codes

  • Instrumentation
  • Acoustics and Ultrasonics
  • Electrical and Electronic Engineering

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